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1·The muddy water needs to be clarified before it is used.

这水太浑了，澄清之后才能用。

2·Firstly, this paper clarified the method of water pricing, the multifunctionality of irrigation, and irrigation water's character of public goods.

分析灌溉水价的作用及其制定理论、灌溉的多功能性、灌溉水的公共物品特性。

3·This year's Nobel Prize in Chemistry rewards two scientists whose discoveries have clarified how salts (ions) and water are transported out of and into the cells of the body.

今年被授予诺贝尔化学奖的这两位科学家的发现，阐明了盐类成分(子)水是如何在人体细胞内外传输的机理。

4·Using which of the deep water characteristics to compute the breaking wave characteristics and then the longshore transport rate is a problem yet not being clarified.

用什么特征波要素来推求破波要素以计算出沿岸输沙率，尚有一些问题业未澄清。