thumbern.制动器thumbn.拇指v.翻阅；示意要求搭车thumb slide rules翼形滑尺thumb/injuries拇指／损伤thumb-print sign指压征thumb wheel switch拨码开关thumb-nail crack指甲形裂纹thumbs around grip普通握thumb wheel control姆指旋转控制器thumb one's nose at对…嗤之以鼻，蔑视thumb-nail sketch简短生动的素描或速写thumb-pressure can指压注油器