The Great St. Bernard Pass connects Switzerland to Italy. 

At 2,473 metres, it is the highest mountain pass in Europe.

at an altitude of ... ⇒ 缩写为 at ^表海拨

• Being at 2,473 meters, ... ^{非谓语动词被省略(当原因状语/介词短语)}

造句：At 4,807 meters, Mont Blanc is the highest peak of the Alps. ^{4807米的勃朗峰是阿尔卑斯山脉的最高峰。}

The famous monastery of St. Bernard, which was founded in the eleventh century, lies about a mile away.

替换表达

• The body of one statue was found among remains dating from the fifteenth century B.C. ^追述到...
• ..., which dates from the 11th century, ...  ^{date from ... (主动)追溯、从某个时候就有了...}
• ..., which dates back to the 11th century, ... ^{date back to ...(主动)追溯到...起源或制作时间}
• ..., which can be traced back to the 11th century, ... ^{can be traced back to ...(被动)可以追溯到...}

For hundreds of years, St. Bernard dogs have saved the lives of travellers crossing the dangerous Pass.

cross + 宾语＋方式状语 = 动词 + across + 宾语

• They quickly loaded a small rubber dinghy with food, matches, and tins of beer and rowed for a few miles across the Caribbean until they arrived at a tiny coral island. ^{动词做方式状语 NCE3-12}
• In 1908 Lord Northcliffe offered a prize of £ 1000 to the first man who would fly across the English Channel. ^NCE3-20

These friendly dogs, which were first brought from Asia, were used as watchdogs even in Roman times.

friendly ^{adj.友好的、无害的}

• environment-friendly ^{adj.环境友好的、有利于环境的(环保)}
• ozone-friendly ^{adj.不破坏臭氧层的、臭氧层友好的}

Now that a tunnel has been built through the mountains, the Pass is less dangerous, but each year, the dogs are still sent out into the snow whenever a traveller is in difficulty.

now（that）^{conj.同时表示时间和原因}

• Now (that) you are a big boy you must behave better. ^{因为有Now的存在，所以后面接与“现在”相关的时态}

疑问词 + ever

Despite the new tunnel, there are still a few people who rashly attempt to cross the Pass on foot.