这里的'力矩,会超过黑板的范围。
The torque in this case would be out of the blackboard.
请看黑板！但我什么都看不到呀！
Look ? Please look at the blackboard! But I can't see anything.
看着黑板。杰克，答案是多少？。
Look at the board. What's the answer, Jack?
这个向黑板里面，所以它是正的。
So this one is in the blackboard, so I call that positive.
他把他们的名字记在一块黑板上。
He chalked up their names on a blackboard.
老师常把最好的作业钉在黑板上。
The teacher usually pins up the best work on the board.
艾丽娜，留下来把黑板擦干净。
Eiina , stay behind and wipe down the blackboard.