這里的力矩,會(huì )超過(guò)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(zhù)黑板。杰克，答案是多少？。

　　Look at the board. What's the answer, Jack?

　　這個(gè)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(lái)把黑板擦干凈。

　　Eiina , stay behind and wipe down the blackboard.