As they break out of all the soft sand, they hit the hard sand他們先是爬過軟沙灘，接著爬上硬沙灘

break out逃脫

He seized every chance to break out of the Nazi concentration camp.

他抓住一切機會從納粹集中營跑出來。

And suddenly all these crows come flocking in and start picking them off突然，烏鴉成群結隊地飛來將他們一個個叼走

flock in成群結隊涌到，蜂擁而至

They flee in flock in fall, leaving the empty city.

它們在秋天成群出逃,棄下空城。

People flock in from all quarters.

人們從四面八方涌來.

pick off采取

Don't pick off any of these flowers.

這些花一朵也不要采摘。

We had to pick off the fruit from the tree.

我們必須從樹上摘下果實。