The causes resulting in cracks in back tube sheet of shell type boilers are analyzed. The mechanism of accidents is stated and some relative solutions to the problem are presented.

分析了锅壳锅炉后管板裂纹产生的原因，阐述了事故发生的机理和处理方法。

youdao

I can't see how we'll ever retreat back to technologies that alienate us, just like we won't go back to buying cars that break down a lot or cathode ray tube TVs.

我认为我们不可能回到让人感到疏离的技术上去，就像我们不会再去买常常坏掉的车或者阴极射线管的电视机一样。

youdao

This also means having a back up plan, in case one of you is sick, you get a flat tire and have no tube, etc.

这也意味着需要一个后备计划，以防你们中的一个不舒服，你的车胎漏气却没有备胎，等等类似的事情。

youdao

Now that Whoopie is back on the tube five days a week, perhaps the company can woo her back into the fold.

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Last week, police in Mexicali found a cannon made from a large tube in the back of an abandoned Dodge Ram pickup truck, said spokesman Edgar Lopez.

CNN: Mexican police nab drug-launching cannon near border

But when Jonny gets a puncture, there are neither of the first two and only a late, lucky find in a back pocket of an inner tube.

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