1.refer to提到;查阅
I mention this point now in passing and shall refer to it again.
这一点现在顺便提一下,以后还会讲到 。
2.By the end of 到...尽头
By the end of the week you will have a clear idea of what your eating habits are.
到这周末你便会清楚自己的饮食习惯了 。
3.responsible for是...原因
The sun's ultraviolet rays are responsible for both tanning and burning.
阳光中的紫外线是皮肤晒黑和灼伤的根源 。
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