... 增加马力发动机或飞机 to soup up 断裂的主要原因 major cause of failure 火灾的主要原因 leading cause of fire ...
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心部组织中的带状铁素体是引起断裂的主要原因。
The fracture mainly is due to the existing of zonal ferrite in the microstructure of matrix.
结果表明，盘条内部存在缺陷是造成断裂的主要原因。
Results indicate that the intrinsic defects in the rod stock is the main cause to the failure.
使用染发剂是另一种干发脆，这是更容易断裂的主要原因。
Using hair dye is another major cause of dry and brittle hair, which is more prone to breakage.
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