Crack, cold laps and lack of fusion belong to planar discontinuity.
属于这种类型的缺陷有裂纹、冷隔、末熔合等。
I stopped and ran laps around a parking lot, and it was remarkable how much being cold affected my coordination.
一次我停下来绕着停车场转了几圈，很明显寒冷对于我的影响有多大。
I stopped and ran laps around a parking lot, and it was remarkable how much being cold affected my coordination.
一次我停下来绕着停车场转了几圈，很明显寒冷对于我的影响有多大。
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