1. a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold. 
   响度单位等于赫的纯音声压级在闻阈上分贝时的响度。
2. 19. When it is struck, a tuning fork produces an almost pure tone, retaining its pitch over a long period of time. 
   19.音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。
3. pure theory of law 
   纯粹法学派
4. They start to practise. they start practise. 
   他们开始练习。
5. Practise deception on sb. 
   欺骗某人。

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