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The reduction of noise has been approached in terms of_____its sources, but the alternative of canceling noise out by adding sound with the opposite wave pattern may be more useful in practice.
A.diffusing
B.tracking
C.concealing
D.isolating
E.eliminating
| 重点单词 | 查看全部解释 | |||
| alternative | [ɔ:l'tə:nətiv] | 联想记忆 | ||
| reduction | [ri'dʌkʃən] | |||
| pattern | ['pætən] | |||
| source | [sɔ:s] |
