bmt basic motion timeelement time基本: basic; fundamental動作: movement; motion; action時間: time; hour基本動作時間研究: basic motion study基本動作: base action; basic acts; basic element; basic motion; basic movements; elemental motion; elementary action; lead-up trick; primitive action; therblig下載手機(jī)詞典可隨時隨地查詞查翻譯