这是个难发的音。
现在Rhiannon的舌头比之前要长1厘米，手术前不能发的音也能发出来了。
Rhiannon's tongue is now 1 cm longer, and she can pronounce words that she couldn't before the surgery.
应该说是因为男高音和女低音发的音具有一定的相似性，由此才扩展引申出女低音。
Originally a "high" man's voice, now more commonly applied to the lower range of women's voices (which is more strictly the contralto).
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