I hired a car the day after landing and bought a comprehensive book of maps, which I found most helpful on the cross-country journey, but which I did not think I should need on the last stage.

定语从句并列 ^{同一层次上的双重定语从句}

1. 两个定语从句修饰同一个名词或短语，中间用并列连词 (and, or 或 but) 连接，此时关系词往往不可省去^{【同一层次上的双重定语从句】}
• This book is intended for foreign students who have already mastered the elements of English, and who now want to use their knowledge of language to read books on their own subjects.
• The past progressive is chiefly used for past actions which continued for some time but whose exact limits are not known.
2. 第一个定语从句修饰前面的名词或短语，第二个定语从句修饰“名词或短语+第一个定语从句” 两个定语从句之间没有并列连词连接。第一个定语从句的关系词（一般是关系代词作宾语） 可省略 ^{【不在同一层次上的双重定语从句】}
• The only person I know who has a skeleton in the cupboard is George Carlton, and he is very pound of the fact.
3. 既是先行词的后置定语，又是另一个分句结构的宾语^{【嵌入式定语从句 (Embedded Attributive Clause) 】}
• …, but which I did not think I should need on the last stage.

She has an adopted son who she says is an orphan. ^{她有一个养子，这个养子据她讲是个孤儿。}
Aleko suddenly acquired a new lamb which he claimed was bought. ^{Aleko 突然得到了一只新的羊羔，这只羊羔他声称是买来的。}

• In this part of the cave, they could hear an insistent booming sound which they found was caused by a small waterspout shooting down into a pool from the roof of the cave.
• Turning back down the main street, we quickened our pace and made our way rapidly towards the stream where we hoped the boatman was waiting.

嵌入式定语从句和插入语的区别；插入语去掉之后应对语法没有影响，也对句子含义也没影响

He’s just published an article which I don’t think is interesting at all. ^{（如果去掉“I don’t think ”对句子含义有影响）}
I met a man whom I thought was a lunatic. ^{（如果去掉“I thought”对语法有影响）}

It was not that I actually remembered anything at all. But my father had described over and over again what we should see at every milestone after leaving the nearest town, so that I was positive I should recognize it as familiar territory.

It is/was not that …, but (that) … ^{不是因为…, 而是因为…}

• It was not that Bruce always underestimated difficulties. He simply had no sense of danger at all.
• It was not that Bruce always underestimated difficulties, but (that) he simply had no sense of danger at all. ^{合并简单句}
• It is not that important, but anyway. ^{无论怎样，这并不重要。}

over and over (again) ^{一再地，屡次地，三番五次地}

• I’ve told you over and over (again) not to do that. 
• A quiet day's fishing, or eight hours in a cinema seeing the same film over and over again, is usually as far as they get.
• She practiced the song over and over again until she got it right. ^{她反复练习那首歌，直到唱对为止。}

be positive (that) … ^对…确定

• Are you absolutely positive you locked the door?
• She was positive that he had been there. ^{她确信他曾在场。}
• This is proof positive that he stole the money. ^{这就是他偷钱的肯定证据。}

familiar / unfamiliar territory ^{熟悉/不熟悉（的领域）}

• Social work is familiar territory to her.
• All this is familiar territory to readers of her recent novels.
• But how do these interlopers fare so well in unfamiliar territory? ^{这些闯入者是如何在陌生领域所向披靡的呢？}
• Lu is also a reminder that when moving into unfamiliar territory it is wise to tactful and courteous. ^{履卦告诉我门，当我门进入未知领域的时候，一定要谨言慎行。}

Well, I had been wrong, for I was now lost.

well ^{interj.used for expressing a feeling such as doubt, surprise, or anger 哎呦（表达怀疑、惊讶或愤怒等感情）}

• Well, they have a lot of nerve!
• Well, she could at least have phoned to say she wasn't coming! 
• "But finance is far more serious."—"Well I don't know really." ^{“但是财政形势更加严峻了。”—“啊，我真的不知道。”}
• She beamed at Patty. "Well! That was a bit of unexpected excitement." ^{她对帕蒂灿烂地一笑。“哎呀，那真是有些出人意料，叫人兴奋哦。”}
• Oh well, it could be worse. ^{哎，算了，情况本可能会更糟的。}