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- 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。
- Who's rubbed my figures off the blackboard? 谁把我写在黑板上的数字擦掉了?
- The transmitter was pulsed by an electron tube. 电子管使发射器产生脉冲波。
- The teacher wrote down the new words on the blackboard. 老师在黑板上写出新单词。
- An electron tube having a cathode and an anode. 电子二极管有一个阳极和一个阴极的电子管
- 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。
- electron blackboard 电子黑板
- His chalk scraped on the blackboard. 他的粉笔在黑板上擦擦作声。
- He chalked out a design on the blackboard. 他用粉笔在黑板上勾划出一个图样。
- Wipe off these scribblings from the blackboard. 把黑板上的涂鸦擦掉。
- The number of electron pairs an atom can share with other atoms. 共用电子对数，共价一个原子与其他原子共用的电子的对数
- They are writing on the blackboard. 他们在黑板上写字。
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
