runfast,fast是什么意思

外研社小学英语三起四年级上册m5 u1 can_you_run_fastppt
3. 快速持续跑(fast continuous run,简称fcr)
外研社小学英语三起四年级上册module5unit1can_you_run_fast_课件ppt
i can run run fast. fast can you run fast?
外研社四年级上册module5 unit 1 can you run fastppt