您要查找的是不是：
- A slogan is over the blackboard. 一条标语在黑板正上方。
- The teacher wrote on the blackboard with a piece of chalk. 老师用一支粉笔在黑板上写字。
- The teacher's chalk grated on the blackboard. 老师的粉笔在黑板上发出刺耳的摩擦声。
- The teacher erased the letters on the blackboard. 老师擦掉了黑板上的字母。
- The teacher chalked out a design on the blackboard. 老师用粉笔在黑板上勾画出一个图案。
- The blackboard is in the front of the classroom. 黑板在教室的前面。
- Please raise your head and look at the blackboard. 请抬起头来，看黑板。
- You operate the mechanism by winding this handle. 操纵这台机器要转动这个把手。
- The watch has delicate mechanism. 这块表有精细的机械装置。
- Let's examine into the basic mechanism involved. 让我们把有关的基本结构搞搞清楚。
- Who's rubbed my figures off the blackboard? 谁把我写在黑板上的数字擦掉了?
- A part of a mechanism that moves in this manner. 横移物以这种方式移动的一个机械零件
- The teacher wrote down the new words on the blackboard. 老师在黑板上写出新单词。
- There's no mechanism for changing the decision. 没有办法改变这一决定。
- An airplane engine is a complex mechanism. 飞机引擎是种复杂的机械装置。
- He took out a piece of chalk and wrote his problem on the blackboard. 他拿出了一支粉笔并在黑板上写下他的问题。
- A device or mechanism that grinds grain. 磨臼，磨粉机磨谷物的装置或机械
- The room was furnished with some old tables, a blackboard, and an old stove. 这间房子里有一些旧桌子，一块黑板和一个旧的火炉。
- A tripping or triggering device on a mechanism. 倾卸装置、钩杆机械装置上断开或启动的装置
- The blackboard has been wiped clean. 黑板擦干净了。
