The measurement of sound speed in the air is studied in the experiment by phase comparison method and standing wave method.
通过实验，应用相位比较法和驻波法对空气中的声速测量进行了研究。
Then the machine cycled through the next phase and instantly she was standing at the sink once again.
然后循环机通过下一阶段，她立刻站在水槽一遍。
Then the machine cycled through the next phase and instantly she was standing at the sink once again.
然后循环机通过下一阶段，她立刻站在水槽一遍。
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