crevasse谐振: resonance oscillation; reson ...曲线: curve; curved line上部: headpiece; ridge凹: low-lying area; depression隐: hide; conceal下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:谐振曲线上部凹隐，即可在微信中查询翻译
