出层顶管道
The feed-pipe is as clean as a whistle, so I'm afraid, if the oil is not getting through to the burner, the valve must be faulty.
送料管干干净净, 所以我担心要是油不通过喷嘴, 阀门一定有毛病.
Run lots of soapy water through the pipe to clean it.
用大量的肥皂水把管子里面冲洗干净.
The water ran away through this pipe.
水通过这条管道流走了.
Flush clean water through the pipe.
用净水冲洗管子。
We had to force the pipe down a narrow hole to get it through.
我们必须把这根管子从那个狭窄的洞中捅下去.
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