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重点讲解：
1. a pile of
叠，摞；
eg. Your letter got buried under a pile of papers.
你的信压在一堆文件下面了。
eg. A sudden wind swept a pile of leaves in.
突然吹起一阵风，刮进一堆树叶来。
2. shake off
甩开；甩掉；
eg. He stamped his feet to shake off the snow from his boots.
他顿脚以便抖落皮靴上的雪。
eg. He twisted and turned in a desperate attempt to shake off his pursuer.
他左拐右转拼命想甩掉追他的人。
3. it's time to do sth.
（从事特定活动的）合适时候；
eg. Now it's time to draw for the big prize!
现在该抽签决定大奖了！
eg. It's time to pack up.
到收工的时候了。
v. 伸展，展开，传播，散布，铺开，涂撒
n.
