在光学显微镜和扫描电镜下观察了处理前后钢样品中裂纹和组织的变化。
An optical microscope and a scanning electron microscope (SEM) were employed to examine the change of the crack and the microstructure before and after the healing treatment.
皮肤样品是自2007年至2009年间用不锈钢标枪收集到的。
The skin samples were collected from 2007 to 2009 with a stainless steel dart.
太空行走的宇航员以前对接头曾进行过几次检查，甚至收集了钢屑样品回地球分析。
Spacewalking astronauts inspected the joint several times before and even collected samples of the steel grit for analysis back on Earth.
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