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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Judging from reports of MiG fighter aircraft, helicopter gunships, tanks and Katyusha rockets churning up the spectacular mountainscapes of the country’s rugged north-west, the description is fitting.

从作战报告来看，在这个国家的西北部，米格战斗机、武装直升机、坦克、卡秋莎火箭炮把这片恢宏壮观、地势起伏的山川景象搅了个天翻地覆，所以说这样描述是恰如其分的。

youdao

Judging from reports of MiG fighter aircraft, helicopter gunships, tanks and Katyusha rockets churning up the spectacular mountainscapes of the country's rugged north-west, the description is fitting.

从作战报告来看，在这个国家的西北部，米格战斗机、武装直升机、坦克、卡秋莎火箭炮把这片恢宏壮观、地势起伏的山川景象搅了个天翻地覆，所以说这样描述是恰如其分的。

youdao