这是因为，女性拥有更高的音域，紧张的时候，声带拉紧，导致音调更高。

That's because women have greater vocal range, and vocal chords constrict when stressed, resulting in a higher pitch.

youdao

拉紧不利的肌肉是紧张的主要原因。

Tensing opposing muscles is a major cause of tension.

youdao