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.
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