smart gear、lean up、lean down都是是什么意思?

smart gear、lean up、lean down都是是什么意思? gear up 用法? gear up 指什么 Lean gear up for和gear up to的区别 并举例! lean sth.There is too much trash in the house.Please lean it up.“Please lean it up. 英语 请问head-gear是什么,headgear是头饰.she adjusted her head-gear,and l helped her. smart smart smart Photos from the protest show police in full riot gear lined up on the road. fixed gear gear是什么意思? Dog gear Firefighters with heavy lifting gear battled to free the surviors from the wreingckage.l怎么翻译 英语翻译2.2.AE source during gear meshingUnderstanding the source of AE activity at the gear mesh is a fundamental pre-requisite if this technique isto be successfully employed for gear diagnostics and prognostics.Toutountzakis [11] highlighted l lean 是什么意思 lean over