1513.the top line news 头条新闻；This is the top-of-the-line laptop. 这是这款手提电脑中质量最好的。the bottom line 底线，The bottom line is that the People’s Daily strictly follows the communist line.It will never cross the line. All the Party members have to come into line with the Party policy.底线是人民日报严格走党报路线。它绝不会偏离这点。党员都必须与党的政策保持一致。这里三个句子用了四个关于line的习惯用法，都是常用的。You have crossed the line when you criticize your boss publicly. 你公开批评老板，这样做就有点不能为人接受了。step over the line, 也是“过线、过分”的意思。They are under constant pressures to step over the line.他们受到很大的压力，要违规作业。push the line,挑战容忍度（push the envelop也是这意思）

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