so you just, just rocking to the side as if he might just fall off the branch,刚才还翻身好像要从树上掉下来一样

fall off跌落；下降

Be careful not to fall off the ladder.

当心别从梯子上掉下来。

Mary scrape her knee when she fall off her bike.

玛丽从脚踏车上摔下来擦伤了膝盖。

they're gonna cross over into another area of forest它们会到另一片森林去

cross over跨越； 交叉

I cross over the pedestrian overpass.

我走过天桥。

Who can cross over such raving wind and water?

谁能穿过这片狂乱的暴风和洪水么?

He was completely asleep just then,它睡得好熟

asleep, sleeping, sleepy这组词的意思不完全相同,其区别在于：

1.asleep和sleepy主要用作表语。asleep的意思是“睡着”,而sleepy的意思是“想睡”。例如：

The baby fell asleep; and I feel sleepy.孩子睡着了,我也犯困了。

2.asleep, sleepy和sleeping都可用作定语,这时的意思也不相同。asleep表示“睡着的”, sleepy表示“贪睡的”,而sleeping除表示“睡着的”外,还可表示与睡眠有关的东西。试比较：