How many spiders are engaged in this work on our behalf?

be engaged in ^{忙于（做）某事、从事}

• He is engaged in politics / business. ^{他忙于政治工作、生意。}
• He is engaged in searching for solutions. ^{他正忙于寻找解决办法。}
• Young people are engaged in seeking their identity. ^{年轻人正忙于寻找自我认同。}
• Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.
• For one thing, being a problem gives you a certain identity, and that is one of the things the young are busily engaged in seeking.

on one’s behalf / on behalf of sb. ^{为了某人的利益 / 代表某人}

• We are raising a fund on behalf of orphans. ^{我们正在为孤儿募捐。}
• I beat you on your behalf. ^{我是为了你打的他。}
• He delivered a speech on behalf of the government. ^{他代表政府发表了演讲。}
• On behalf of the department I would like to thank you all. ^{我谨代表本部门感谢大家。}

One authority on spiders made a census of the spiders in a grass field in the south of England, and he estimated that there were more than 2,250,000 in one acre; that is something like 6 million spiders of different kinds on a football pitch.

on ^{做后置定语}

• Yuan Longping is a leading authority on hybrid rice. ^{袁隆平是杂交水稻方面的权威。}
• When he asked if Mr. Lane lived there, the policeman on duty told him that since his defeat, the ex-Prime Minister had gone abroad.

that is (to say) ^{也就是说；确切地说}

• Everybody admires him for his great sense of humour -- everybody, that is, except his six-year-old daughter, Jenny.
• The fare is reduced for children, that is anyone under 15 years old.
• Languages are taught by the direct method, that is to say, without using the student's own language.
• One solution would be to change the shape of the screen, that is, to make it wider. ^{一种解决方案是改变屏幕的形状，也就是说，把它做得更宽。}
• I'll meet you in the city, that is, if the trains are running. ^{我会在市里见你，也就是说，如果火车运行的话。}
• I loved him — that is, I thought I did. ^{我爱他——也就是说，我以为我爱他。}

authority ^{权威；当局}

• When the fire had at last been put out, the forest authorities ordered several tons of a special type of grass seed which would grow quickly.
• The French authorities had the plane packaged and moved in parts back to France.
• There he was picked up by a policeman and sent back to England by the local authorities.
• It is all too easy to blame the railway authorities when something does go wrong.
• The authorities ordered the evacuation. ^{当局下令疏散。}
• The local authorities have imposed a curfew. ^{地方当局实行了宵禁。}

something like ^{大约，大概}

• Today we can see even his famous clash with the Inquisition in something like its proper perspective.
• The price is something like $300. ^{价格大约是300美元。}
• They reached something like an agreement. ^{他们达成了某种形式的协议。}
• It looked something like a bear. ^{它看起来像是一只熊。}

… that is some / something in the region of 6,000,000 spiders of different kinds on a football pitch.

pitch 、field  / court / ring、rink ^场地种类

Spiders are busy for at least half the year in killing insects.

be busy (in) doing sth. ^{忙于做某事}

• Her eyes were fixed on her plate and in a short time, she was busy eating.
• Meanwhile, my tongue was busy searching out the hole where the tooth had been.
• In a short time, I was busy mixing butter and flour, and my hands were soon covered with sticky pastry.
• She is always busy preparing dinner. ^{她总是忙着准备晚餐。}
• The workers are busy repairing the road. ^{工人们正忙着修路。}
• He was busy writing a report when I called. ^{我打电话时，他正忙着写报告。}

It is impossible to make more than the wildest guess at how many they kill, but they are hungry creatures, (being) not content with only three meals a day.

guess ^{猜测（做名词、动词）}

• Guess what? I just won the lottery! ^{猜猜怎么了？我刚中彩票了！}
• Guess what? John got engaged to Susan!
• Make a guess at who’s knocking the door. ^{猜猜是谁在敲门（guess做名词）。}
• Guess who I ran into yesterday? ^{猜猜我昨天遇见了谁？}

wild ^{离奇的；不切实际的}

• She had a wild imagination. ^{她有丰富的想象力。}
• It’s just a wild guess. ^{这只是胡乱猜测。}
• He made some wild accusations. ^{他做出了一些毫无根据的指控。}
• The banks were in crisis due to wild speculation by the rich. ^{这些银行由于富人们的野蛮投机行为而陷入危机。}
• Working with you is beyond my wildest dreams. ^{做梦也想不到...}

more than + n. ^{超过；不仅仅...}

• These days, it is differences in national regulations, far more than tariffs, that put sand in the wheels of trade between rich countries.
• The open sea was deep and mysterious, and anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bed was flat.
• This is more than a book — it’s a philosophy. ^{这不仅仅是一本书，而是一种哲学。}
• Peace is more than the absence of war. ^{和平不仅仅是没有战争。}
• The loss is more than we expected. ^{损失超出了我们的预期。}

be not content with ^不满足于

• She is not content with being an average student. ^{她不满足于做一个普通的学生。}
• They are not content with local success — they want to go global. ^{他们不满足于地方上的成功，想要走向全球。}
• The company is not content with its current market share. ^{公司对现有市场份额不满意。}

They are enterprising young people, not content with the dull routine of everyday life. ^{他们是有事业心的年轻人，不会满足于平淡的日常生活。}

It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.

be estimated ^(据)估计

• The loss is estimated to reach upwards of 30000 yuan. ^{据估计损失达30000元以上。}
• They are estimated to employ around 50, 000 gunmen. ^{他们估计雇用约50,000名枪手。}
• The cost to repair it was estimated at $800. ^{修复的成本估计为800美元。}
• Adjusted odds ratios were estimated with logistic regression. ^{用逻辑回归法评估了调整后比率。}

鼻腔爆破 ^{nasal explosion [t] / [d] + [n]}

写作题材：Question-Answer Pattern ^{问题回答模式：给出问题，然后自问自答。}