It does this by fitting small piezoelectric acoustic sensors to parts of the structure to detect the particular frequency of noise caused by a crack in aircraft-grade aluminium.

把小型压电声传感器安装到这种构造部位上，检测由航空级铝材裂纹所致的特定频率的噪音，靠这样就能监测飞机裂纹。

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The moment that sensors detect a hairline crack anywhere in the aircraft, microscopic nano-capsules containing a high-tech adhesive would be released to seal the fissure.

当传感器检测到飞机在任何时候的一个裂痕时，包含高科技粘合剂的微观纳米胶囊将释放粘合裂痕。

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All of these tests are used to detect surface crack discontinuities.

所有这些测试是用来检测表面裂缝不连续性。

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WifiSLAM, which is roughly two years old, is among a slew of technology companies trying to crack the problem of how to detect a mobile-phone user's location when the user is indoors and traditional GPS technology doesn't work.

WSJ: Apple Buys Indoor GPS Specialist