They opened a can of sardines.

他们打开了一罐沙丁鱼。

《柯林斯英汉双解大词典》

They grow up to four metres (12 feet) in length, weigh as much as 250kg (550lb) and, when chasing prey—mostly sardines—can swim at a speed of 70kph (45mph).

它们能长到4米长（12英尺），250公斤重（550磅），当追赶猎物时——大多数时候是沙丁鱼，它们的速度能达到时速70公里（45迈）。

youdao

It is not a pleasant ride because the train can be full of people. It is so crowded that we are packed like sardines? Just like small fish in a can.

这并不是个舒服的交通工具，因为火车上可能挤满了人，挤到我们像沙丁鱼一样被装在罐头里。

youdao

With luck, smart sardines from the previous decade can look to grow fat from the fruits of their own expensive education.

FORBES: Sharks, Sardines And 'The Year For Equities'

One of the center squares contained a newly discovered pillar with the most intricate bas-reliefs to date: rows of sinuous-necked cranes and snakes packed efficiently together, like sardines in a can.

NEWYORKER: The Sanctuary