The soft water through softening process must be used to avoid its scale-formation blocking the waterway which may lead to unnecessary fault.
必须使用经过软化处理的软水,以免结垢堵塞水路,引起不必要的故障。
2
The quantitative analysis of the economic growth effect can help us avoid some unnecessary problems in the use of public health expenditure, and decide the proper scale of public health expenditure.