blackboard是可數名詞嗎

blackboard用法例句

1、There was a blackboard with seven names chalked on it.

黑板上用粉筆寫著7個人名。

2、Teaching off a blackboard is boring, and undoubtedly turns people off.

照本宣科枯燥乏味，無疑會使人們喪失學習興趣。

3、With a stick of chalk he wrote her order on a blackboard.

他用一截粉筆將她的指示寫在黑板上。