- at the bottom of在…的底部;
- a block of一大块…;
- bottom view底视图，仰视图;
- bottom up颠倒，<俗>干杯！;
- bottom sill底槛;
- bottom rail下冒头;
- bottom pipe distribution下分式管分配;
- bottom out降至最低点;停泻回升;
- bottom of foundation基础底面;
- bottom layer of the reinforcing steel底层钢筋;
- bottom hinged ventilator下折翼气窗;
- bottom gate底部闸门;底浇口;底孔闸门;底注式浇口;
- bottom fell out底部掉了出来
- bottom cover底盖，后盖;
- bottom color[化] 底色;
- block up封闭; 堵塞;垫高;封锁;
- Block trade大宗股票交易;
- block signal块信号;
- block record办理闭塞登记簿，成组记录;块记录;
- block plan方框图;
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