购买轮胎却变成了使人困惑的问题。

Buying tires has become confusing.

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瓦努阿图地域一直在履历着使人困惑的火山勾当，地球的这个部分地震勾当是很活跃的。

This area, Vanuatu, has been experiencing puzzling volcanic activity, and this part of the globe is very seismically active.

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放空管路水力计算是天然气集输工程设计中一个令人极感兴趣、却又常常使人困惑的问题。

The hydraulic calculation of vent line is an interesting but difficult problem in natural gas gathering engineering design.

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