声波传递需要介质，空气，水，岩石都行。
They need something to move through, like air, water, or rock.
是什么使水成为绝佳的生命存在的介质？
是水的化学结构使它成为绝佳的生命存在的介质。
It is the chemical structure of water that makes it an excellent medium for life.
水是一种最有害的介质。
在这种方法中，“自由水”样品是直接在水介质中取得的。
In this method "free water" samples are taken directly in the aquatic medium.
水介质作为一种环保型传动介质已在各种液压传动系统中获得了广泛的应用。
Water as environmental protection transmission medium has been applied in many kinds of hydraulic system.
使用介质：水、蒸汽、油品等。
常用介质有：水蒸汽、导热油、热水、冷却水等。
The normal media are: steam, thermal oil, hot water and chill water.
水是细胞发生生物化学反应的介质。
Water is the medium in which the cell's biochemical reactions take place.
液体介质：水、酸、碱、泥浆、纸浆、染料、油类、牛奶、酒类、饮料等。
Liquid media: water, acid, alkali, mud fluid, paper pulp, dyestuff, oil, milk, alcohol, drinking. etc.
夹套换热介质：蒸汽(或热水)、冷却水。
Heat transfer medium of clip set: steam (or hot) water, cooling water.
可根据需要任意选择以水或热媒油当传热介质。
Water/oil dual purpose mmachine can use either water or oil heating medium.
可根据需要任意选择以水或热媒油当传热介质。
Water/oil dual purpose mmachine can use either water or oil heating medium.
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