相比以前所使用的一些根据恒星重力引起的震动来探测行星的方法，凌日探测法可以发现体积小很多的行星。
Transit detection can pick up much smaller planets than previous methods based on gravity-induced wobbles in the stellar parent.
根据超声波探测理论，讨论了多脉冲循环法用作非接触式流量检测的原理。
According to the theory of ultrasonic inspection, the principle of flow inspection using multi pulse circulation method was discussed.
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