他开始用粉笔在一块“黑板”上算题。

He began to work a problem on a "blackboard" with a piece of chalk.

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他开始用粉笔在一块“黑板”上算题。

But it was not a blackboard.

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三人一起玩脑力时代并且比赛一道计算题。

The three try out Brain Age and compete in an arithmetic challenge.

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三人一起玩脑力时代并且比赛一道计算题。

The three try out Brain Age and compete in an arithmetic challenge.

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