button headmushroom-head头: 5点就得动身 have to start before ...扁圆头螺栓: buttonhead bolt扁圆头铆钉: button head rivet; buttonhead rivet; mushroom rivet; raised-head rivet扁圆头铆头: raised-head rivet大扁圆头铆钉: large oval head rivet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:扁圆头,即可在微信中查询翻译