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1.Ice Age 冰川期,冰河时代
例句：But also I think those Ice Age conditions were critical as well.
但我认为当时冰河时代的客观条件也是极为关键的。
2.ice cream 冰琪淋
例句：The boy likes ice cream very much.
这个男孩很喜欢冰激凌。
3.if I were you 如果我是你
例句：If I were you, I would not do this.
如果我是你，我就不会那么干。
4. if not 要是不
例句：But if not costs or efficiency, then what?
但是，如果不用成本和效率，又用什么呢？
5.if necessary 如果必要的话
例句：Begin with a round of introductions if necessary.
可以以一系列简介开始，如果必要的话。
6.if only 要是，只要，要是…多好
例句：If only I could see him once.
我只要再见到他一次就好了。
n. 效率，功率
