differential action差: send on an errand; dispatch动作: movement; motion; action用: 40分钟跑完全程 run the course in 4 ...差动作用, 微分作用: differential action半自动作用: semiautomatic action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:差动作用，即可在微信中查询翻译
