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。
- Her designs have a strong visual appeal. 她的设计在视觉上很有感染力。
- Please raise your head and look at the blackboard. 请抬起头来，看黑板。
- visualization blackboard 可视化黑板
- Who's rubbed my figures off the blackboard? 谁把我写在黑板上的数字擦掉了?
- Telescopes and microscopes are visual instruments. 望远镜和显微镜是光学仪器。
- Near-sightedness is a visual defect. 近视是一个视力缺陷。
- Primary school teachers use a lot of visual aids. 小学教师使用大量的视觉教具。
- The teacher wrote down the new words on the blackboard. 老师在黑板上写出新单词。
- 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。
- 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。
- The blackboard has been wiped clean. 黑板擦干净了。
- His chalk scraped on the blackboard. 他的粉笔在黑板上擦擦作声。
- Aerial navigation by visual identification of landmarks. 地标领航用可视地标来进行飞机航行
- He chalked out a design on the blackboard. 他用粉笔在黑板上勾划出一个图样。
