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1·The impulsive force of breath is the motive force of sound production when a person is singing; so it is the key link in vocal music training.

气息力是人在歌唱时的发声动力，气息力的训练是声乐训练的重要环节。

2·The sound field of the Continuous Wave and the Impulsive Wave is described by the directivity function.

用指向性函数分别描述了医用线列阵单频波和宽带波声场。