缺: Ⅰ动词1.(缺乏; 短少) be short of; lack 短语和例子缺吃缺穿 have insufficient food and clothing; 缺人手 be short of hands; 什么也不缺。 nothing is lacking. 他们不缺资金。 they do not lack for funds. 这花儿缺水。 the flowers need
摩擦: 1.(互相接触的两物体作来回相对运动) rub; chafe 短语和例子轴颈在轴承面上摩擦。 the journal rubs against the bearing surface.2.[物理学] (相互接触的两物体在接触面上发生阻碍相对运动的现象) friction 短语和例子滚动摩擦 rolling friction; 滑动摩擦 sliding friction; 把
