重点讲解：
1. gobble up 狼吞虎咽；贪婪地吃；
The boy gobbled up an ice-cream cone.
那个男孩大口大口地吃完了一个蛋卷冰淇淋|o.DV%G0il&+|G=sdA。
2. stay behind 留下；
He found it unnecessary for us to stay behind.
他感到我们不必要留下来(z+u^h&@N9I。
3. dry out (使)变干；(使)干透；
Environmentalists say that diverting water from the river will lower the water table and dry out wells.
环保主义者称引流河水会导致地下水位下降和水井干枯5*xIIi6RAqEtn2。
4. when it comes to 谈到；涉及；
They are inexperienced when it comes to decorating.
说到装修，他们就没有什么经验了PfZZ5fTy1[k#D。