To build a tunnel, the problem of ventilation must be first solved.
要建造一条隧道，通风问题得首先解决。
The problem of cathode design is the key and difficult one should be solved first.
阴极设计是电解加工首先要解决的问题，也是电解加工中难以解决的问题。
First, to establish the water supply system, so that health problem can be solved.
首先，建立给水系统，因此可以解决健康问题。
Janice: : The first problem is supposed to be solved after the investigation.
贾尼斯：第一个问题调查淸楚之后才得以解决。
Janice: : The first problem is supposed to be solved after the investigation.
贾尼斯：第一个问题调查淸楚之后才得以解决。
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