词汇	He clenched his fists
释义	He clenched his fists. 他紧握拳头。
随便看	variable speed drive gearing variable speed drive motor variable speed drive unit variable speed drive unit, hydrostatic variable speed electric drive variable-speed electric submersible pump variable speed engine variable-speed engine variable-speed-eonstant-frequeney variable speed feed variable speed feed roll variable-speed feed roll Variable speed feedwater pump variable speed flat belt variable speed fluid coupling variable speed fluid couplings variable-speed fluid drive variable speed friction wheel variable speed gear variable-speed gear variable speed gear box variable-speed gearchange gear, gear change box variable-speed gear drive variable-speed gearing variable speed gear motor