The spark optic fiber sensor has the advantages of high anti-interference ability, low cost, operating reliability and strong light signal is feasible to applied to combustion knocking detection.

火花塞光纤传感器抗干扰好、成本低、工作可靠、光信号强，用于爆震燃烧检测是完全可行的。

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According to figures released by the Israeli defence ministry these new anti-missile batteries opened up 573 times, knocking down 421 out of 1, 506 missiles fired from Gaza.

BBC: How did Iron Dome perform over course of Gaza clash?

Mr Putin also reiterated his vague, if superficially enticing, proposal for an international effort to build regional anti-missile defences, with the aim of knocking out rogue rockets soon after their launch.

ECONOMIST: Russia and the United States: Best of foes | The