backstrokebackward stroke返回: return; go back; revert; rec ...冲程: travel; stroke; 4返回行程，返回冲程: return stroke反回冲程: return stroke急回冲程: accelerated return stroke; quick return stroke; quick-return stroke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:返回冲程，即可在微信中查询翻译
