During the summer months, the monastery is very busy, for it is visited by thousands of people who cross the Pass in cars.

in cars = by car

表示“使用某种交通工具”的介词短语，“by”后要直接加单数名词；“in”后的名词要有人称和数的变化。

• You can go to the airport in my car. ^{by car不能强调谁的车}
• We crossed the river in a boat. ^{by boat不能强调几艘船}

As there are so many people about, the dogs have to be kept in a special enclosure.

(With) so many people (being) about, the dogs have to be... ^独立主格

keep ^{v. confine 把....关起来}

• He was kept / confined in prison.
• You shouldn't keep / confine the bird in a cage.

In winter, however, life at the monastery is quite different.

 Life ^所有格

• life on a desert island ^荒岛生活
• life in the army ^军旅生活
• life on campus 校园生活

quite ^{adv. completely 完全，截然}

• The other side of the picture is quite the opposite.^NCE3-30
• He used to sleep during the day and work at night, quite unaware of the fact that he had become the ghost of Endley. ^NCE3-30

The temperature drops to -30° and very few people attempt to cross the Pass.

to ^下降到；by ^下降了

• The temperature drops by 10° ^{下降了10度}
• The temperature drops to 10° ^{下降到10度}