重点讲解：
1. keep sb. from doing sth. 阻止（或防止、阻碍）…做；
例句：She said that even though people may try to control their expressions, most are not able to keep their feelings from showing on their faces.
她说，即使人们试图控制自己的表达方式，但是大多数人都无法阻止他们把自己的感受反应到面部表情上^26&^^1mY~Rs;a。
2. heat up 变热；
例句：The room was cold when we arrived, but soon began to heat up.
我们到达时房间里很冷，但很快就变热了起来VeWv-[w&KZg%pW7~H8&。
3. be packed with 挤满；塞满；
例句：The plane was packed with Dutch holidaymakers.
飞机上载满了荷兰的度假者_Rufvb*Y9;M#bp。
4. cool down (使)变凉；(使)冷却；(使)降温；
例句：Avoid putting your car away until the engine has cooled down.
在发动机冷却之前不要把车开进车库里7fM_Zs0JR^Qx。