He chalked the message on the blackboard.
他用粉笔把这条消息写在黑板上。
On a blackboard, he drew five concentric circles.
他在黑板上画出五个同心圆。
Look at the blackboard, pupils.
同学们，请看黑板。
我正在擦黑板。
She called on me in front of the blackboard.
她在黑板前叫我。
I can't see the words on the blackboard clearly.
我看不清黑板上的字。
Which of the following looks like the cat on the blackboard?
下列哪一项看起来像黑板上的猫？
The master sat throned in his great chair upon a raised platform, with his blackboard behind him.
老师像皇帝一样坐在高高的讲台上的大椅子上，身后是黑板。
Be sure to include in your notes information that your teacher repeats or writes on the blackboard.
一定要在你的笔记中包含老师重复或写在黑板上的信息。
Are you remembering what it is used for, or the sound it makes when the teacher writes on the blackboard?
你记得它的用途或者当老师在黑板上写字时它发出的声音吗？
Singaporean head chef Tommy Teh Kum Chai offers daily specials on a blackboard, rather than sticking to a menu.
新加坡厨师长TommyTehKumChai提供每日的特色菜，并写在黑板上，没有固定的菜单。
Interactive whiteboard and its system convert the traditional blackboard lecture mode into electronic lecture mode.
交互式白板及其系统将传统的黑板课堂教学模式转化为电子课堂教学模式。
Anything the students needed to know was put up on the blackboard and the students copied it down into their notebooks.
学生们需要知道的东西都贴在黑板上，学生们把它抄在笔记上。
It is a luxury in such circumstances to expect individual attention, especially in classes where students in the back rows can hardly see the blackboard.
在这种情况下，期望个人保持注意力是一种奢侈，尤其是在课堂上后排学生几乎看不见黑板的时候。
He explained everything slowly and clearly on the blackboard.
他在黑板上慢慢地、清晰地解释了一切。
John saw a blackboard with a note written on it.
约翰看到一块黑板，上面写着一条留言。
I can't see what our teacher wrote on the blackboard.
我看不清老师在黑板上写了什么。
In order to see the blackboard clearly, she must wear glasses every day.
为了看清楚黑板，她必须每天戴眼镜。
"You should watch the caterpillars carefully every day." Mr. White said and wrote some instructions on the blackboard.
“你们要每天仔细观察毛毛虫。”怀特先生边说边在黑板上写了一些说明。
He showed up at Zeng's home the next day with a blackboard, a ruler and a box of chalks.
第二天，他带着一块黑板、一把尺子和一盒粉笔来到曾的家里。
The teacher changed my seat to the front so that I could see the words on the blackboard clearly.
老师把我的座位换到前面，以便我能清楚地看到黑板上的字。
Unlike other online courses that film teachers giving classes, Khan's videos only use his voice and a digital blackboard for writing.
与其他拍摄教师授课的在线课程不同，可汗的视频只有他的声音，还有做板书的数字黑板。
Huang Shengen tied a small blackboard to his motorbike, together with all his teaching things and an alarm clock around his neck, and then started his ride.
黄申根把一块小黑板连同他所有的教学用品绑在他的摩托车上，把一个闹钟挂在他的脖子上，然后开始了他的骑行。
She marked a square on the blackboard.
她在黑板上画了个正方形。
The chalk rasped across the blackboard.
粉笔划过黑板发出刺耳的声音。
Think about the questions on the blackboard.
请考虑一下黑板上的问题。
She writes beautifully on the blackboard.
上课时，她能写一手优美的板书。
She rubbed the exercises off the blackboard after class.
下课后她把习题从黑板上擦掉。
She rubbed the exercises off the blackboard after class.
下课后她把习题从黑板上擦掉。
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