We designed the experiment to test the new drug.

我们计划用这个实验来检验这种新药。

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We designed the new machine for the purpose of increasing production.

我们设计这台新机器，目的是为了提高产量。

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We designed the new machine for the purpose of increasing production.

我们设计这台新机器，目的是为了提高产量。

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