19世纪中期以后则逐渐强调实证分析。

After the mid-time of 19th century analysing substantial evidence was gradually emphasized on.

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我们就分期付款！交货后两个星期付头期款，以后则每个月付一次。

We will pay in installments, with the first payment to be two weeks after delivery, then once a month after that.

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在该转变点前铜的去除率随置换时间增加迅速增加，以后则增加缓慢。

Before it the removal efficiency of copper increases rapidly as the increase of displacement time, but after it slowly.

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