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本集核心英语单词及例句：
1.roll (v.)左右摇晃；翻滚
Their car went off the road and rolled over.
他们的车冲出公路，翻倒在一旁。
2.snowball (v.)雪球
We always play outside, have snowball fight, and make snow man.
我们一直都在外面玩，打雪仗，堆雪人。
3.attach (v.)贴上，系
We attach labels to things before we file them away.
存档前，我们先贴上标签。
