It seems more to the point to think of it as something emotive - as the expression of a mood.
或许我们应当把它视作某种感性的体验，一种情绪的表达。
High frequency pulsed sounds might be used for echolocation, and low frequency time continuous signals related with communication and emotive state expression.
高频脉冲信号可能与回声定位有关，而低频连续信号可能与通信和情感表达有关。
High frequency pulsed sounds might be used for echolocation, and low frequency time continuous signals related with communication and emotive state expression.
高频脉冲信号可能与回声定位有关，而低频连续信号可能与通信和情感表达有关。
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