1. packed like sardines 挤得像沙丁鱼罐头
I hate taking subway in rush hours. We're all packed like sardines and it's always hot and smelly.
我讨厌在高峰期乘地铁。地铁里拥挤不堪，而且总是又热又臭。
短语释义：
packed like sardines 字面意思是“挤得像罐头里的沙丁鱼”，也就是形容在人多的场合下，拥挤不堪的场面。
练习：
The bus arrived at the station with passengers packed like sardines.
那辆汽车到站了，车里的旅客挤得像罐头里的沙丁鱼。
2. So crowded that... 太拥挤了，以至于……
The bus is so crowded that I can hardly move.
公交车太挤了，我动都动不了。
短语释义：
So... that加形容词crowded, 表示“太拥挤了，以至于……”，用来形容拥挤过度导致……的后果。
练习：
The bus is so crowded that I am keeping stand all the way.
公交太挤了，我站了一路。
3. bustle with 充满
The passageway of the subway station is bustling with people.
地铁通道里是熙熙攘攘的人流。
短语释义：
bustle with充满，一般用来形容有活力的，熙熙攘攘的热闹地方或场面。
练习：
The street was bustling with Christmas shoppers.
街道上挤满了为欢度圣诞节购物的人群。