1. as white as snow 洁白如雪(white 视觉上的颜色)

　　Eg: His hair is as white as snow.

　　他的头发洁白如雪。(放首周杰伦的发如雪?)

　　2. be as pure as the driven snow 内心纯洁的 (pure 精神上的纯洁) the snow is driven by a shovel¹.

　　to be morally good.

　　eg: How dare he criticize me for having an affair? He's not exactly as pure as the driven snow himself.

　　他怎么敢埋怨我having an affair?他自己也不是冰清玉洁的。

　　3. snowed in (physically) 被大雪困住了。

　　i can't get there, i'm snowed in.

　　where r u snowed in？

　　i'm snowed in at Ba bao shan.

　　4. be snowed under 被困住了

　　overwhelm.

　　注意是说工作太多或者手头的事情忙不过来，分身乏术。

　　to have so much work that you have problems dealing² with it all.

　　eg: She wants me to take some time off but I'm snowed under with work at the moment. (often + with)

　　她想让我抽出点时间来给她，可我当时工作太忙了。

　　5. a snowball effect 雪球效应 snowball(动词vt)

　　如同雪球一样越滚越大，形容事物发展规模速度疯狂增长。

　　a situation in which something increases in size or importance at a faster and faster rate.

　　eg: "Sally's happy about how her new seafood³ restaurant is doing. Business was slow at first but it's really snowballed the

　　last couple of months: now you have to wait in line to get a table."

　　"沙利对她新开的海鲜饭馆很满意。一开始，生意很清淡，但是最近两个月来生意越来越好。现在你要座位还得排队等。"