這里的力矩,會超過黑板的范圍。
The torque in this case would be out of the blackboard.
請看黑板！但我什么都看不到呀！
Look ? Please look at the blackboard! But I can't see anything.
看著黑板。杰克，答案是多少？。
Look at the board. What's the answer, Jack?
這個向黑板里面，所以它是正的。
So this one is in the blackboard, so I call that positive.
他把他們的名字記在一塊黑板上。
He chalked up their names on a blackboard.
老師常把最好的作業(yè)釘在黑板上。
The teacher usually pins up the best work on the board.
艾麗娜，留下來把黑板擦干凈。
Eiina , stay behind and wipe down the blackboard.