Engineering practice witnesses that the heat-exchangers used of spiral finned tubes instead of that used of smooth tubes is an effective method lightening abrasion.

工程实践中发现，用螺旋翅片管受热面代替光管受热面是一种有效解决磨损问题的方法。

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Engineering practice witnesses that the heat-exchangers used of helix finned tubes instead of that used of smooth tubes is an effective method lightening abrasion.

工程实践中发现，用螺旋翅片管换热器代替光管换热器是一种有效解决磨损问题的方法。

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Unlike a jet plane, the shuttle has a fragile heat shield that can be easily damaged by rain or lightening.

NPR: NASA Sets New Discovery Launch Date for July 4