An acoustic-emission pulse contains a very wide range of frequency components, extending up into the megacycle range.

声发射脉冲就包含一个很宽的频率组成范围，可扩展到兆赫。

youdao

An acoustic-emission pulse contains a very wide range of frequency components, extending up into the megacycle range.

声发射脉冲就包含一个很宽的频率组成范围，可扩展到兆赫。

youdao