单词	保留行为
释义	保留行为医retention behavior
随便看	percussion press percussion press, friction screw press percussion primer percussion resonance percussion reverse circulation percussion reverse circulation drill percussion rhythm percussion riveting machine percussionrock drill percussion rock drill percussion-rotary bit percussion rotary boring percussionist percussionists percussion jumper percussion lock percussion lock gun percussion machine percussion manipulation percussion mark percussion marks percussion massage percussion mechanism percussion method percussion mortar