The seawater encroachment is a problem of water quality.
海水入侵是一个水质问题。
However, the heater has the problems such as small flow and difficult heating owing to the problem of water quality when the period of use becomes longer.
但是因为水质的问题,随着使用时间的变长,热水器会出现流量变小、加热困难等问题。
The water damage of bituminous pavement is a general quality problem of highway engineering.
沥青路面水损害问题是公路工程质量通病之一。
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