ferv=boil,表示沸，热
fervid a 热情的，热烈的
perfervid a 十分热情的
fervent a 热切的
fervor n 热烈，热情
fervescent a 发热的
defervesce v 退烧退烧)
effervesce v 沸腾;冒泡
effervescent a 沸腾的;热情洋溢的
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