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1.make up 占据
This made up 15% of their total income.
这是他们总收入的百分之十五。
2.by chance 偶然；意外地
Talked to a stranger you meet by chance in the wood.
对一个你在树林中偶然遇到的陌生人说话。
3.bubble up 冒泡；喷涌
The warm gases bubbled up through the water.
暖气从水里噗噗地冒了出来。
4.be lethal to 对...是致命的
It sounds simple, but killing all of these blood-producing marrow cells would be lethal to humans.
这想法听起来挺容易，但是如果杀死所有的造血骨髓细胞，这对于人体来说是致命的。
