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With their greater infrequency the sounds increased in strength and sharpness.寂靜的間歇逐漸變長;聲音的遲延變得難以忍受....

n.很少發(fā)生，罕見...

infrequency的音標(biāo)：infrequency的英式發(fā)音音標(biāo)為：[?n'fri:kw?ns?]infrequency的美式發(fā)音音標(biāo)為：[?n'frikw?ns?]...