knee fold膝: knee状: form; shape褶皱: wrinkle鞍状褶皱: saddle fold薄壳状褶皱: thin-shelled fold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:膝状褶皱，即可在微信中查询翻译
