All it required was a bit of work.

它所需要的只是少量工作。

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It can provide thick green grass without the work or wait required to grow a lawn from seed.

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Now, the polio vaccine that Salk produced was very effective, but it required a fairly large dose of the vaccine and it had to be injected into the arms of children.

索尔克生产的小儿麻痹症疫苗效果显著,但是,该疫苗的单支注射剂量非常大,而且必须通过小孩的手臂进行注射

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Is it required for freshman?

这是大一新生的必修课吗？

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So serious was her crime that it required 14 policemen in two vans to arrest her.

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The only problem was that the components beneath it required the device to be stiff.

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For starters, as was mentioned, it required cutting out a huge chunk of the floor.

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