所有的飞机都在接受检查，看是否可能有裂纹和腐蚀现象。
All planes are being inspected for possible cracking and corrosion.
奥巴马星期五在宾夕法尼亚州匹兹堡的卡内基-梅隆大学发表讲话，并观看微型机器人水下探索和检查下水管道是否有泄漏和裂纹。
He gave the address at Carnegie Mellon University in Pittsburgh, Pennsylvania, where on Friday he watched a display of mini-robots that explore water and sewer pipes looking for leaks and cracks.
确定是否有部件进行过改装，或被其他部件替代；检查所有部件是否有磨损、裂纹、变形和划痕；
Determine whether any parts have been modified or superseded by other parts. Examine all parts for abrasion, cracks, distortion and scratches.
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