Shopping online has its disadvantages, such as unsafety.

网络购物也有缺点，比如说不安全。

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Unsafety behavior is one of the main causes of injury accident.

分析人的不安全行为是造成伤亡事故的重要原因。

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The low volume-weight of the embankment dam is an factor of unsafety of Andi Reservoir Project.

该工程由于坝体填土的干容重偏低，故十分担心其安全问题。

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