结果表明，沿一次晶晶界的成分偏析对裂纹扩展阻力的降低作用是铸钢中贝壳状断口形成的主要原因。
The results show that main cause of conchoidal fracture forming is that composition segregation in solidification grain boundary of casting steel reduces the resistance of crack propagation.
当阻力位确定之后，接下来就要等待第一次反弹。
Once the resistance levels have been identified, the next step is the wait for the first bounce after the gap.
这对于于你第二次或者第三次尝试“全身阻力训练”来说无疑是个好消息，而且一口气爬五层楼也不再是什么事儿了。
Not only is this good news for you when taking your second or third go at a TRX class, but now that fifth floor walk-up is no problem.
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