1. Tom lived for many years in this vale of tears. 
   汤姆在这尘世上活了许多年。
2. Circumstances combined early to make her view the world as a vale of tears. 
   种种境遇使她很早就认为这世间苦难无边。
3. air blast circuit breaker 
   压缩空气断路器
4. calculation of magnetic circuit 
   磁路计算
5. chopped mode rectifying circuit 
   斩控整流电路

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