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We won't be able to tell what skills the man has until we try him out.
要等试用一个时期以后, 我们才能知道这人有什么专长。
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Scientists tried out thousands of chemicals before they found the right one.
科学家们试验了数千种的化学药品才找到一种合适的。
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The idea seems good, but it needs to be tried out.
这办法似乎很好, 不过需要检验。