n.黑板
blackboard的复数

原形：blackboard复数：blackboards

The teacher wrote on the blackboard with a piece of chalk.
老师用一支粉笔在黑板上写字.
His chalk scraped on the blackboard.
他的粉笔在黑板上擦擦作声。
Teachers usually write on the blackboard.
教师通常在黑板上书写。
The teacher wrote an equation on the blackboard for us to solve.
老师在黑板上写了一个方程式让我们解答。
Students gathered around the blackboard, attentively listening to the lecture.
学生们围在黑板旁，专心听讲。
She erased the old notes from the blackboard before starting the new lesson.
她在开始新课前擦掉了黑板上的旧笔记。
I grabbed a piece of chalk from the tray to write on the blackboard.
我从粉笔盒里拿起一支粉笔准备在黑板上写字。
The blackboard was a crucial tool for the teacher's teaching method back then.
那时，黑板是教师教学方法的重要工具。
The students drew diagrams and formulas on the blackboard during the science class.
在科学课上，学生们在黑板上画图表和公式。
After class, the janitor cleaned the dusty blackboard thoroughly.
下课后，清洁工仔细地清理了布满灰尘的黑板。
In the old school, they used blackboards instead of interactive whiteboards.
在过去的老学校里，他们使用黑板而不是交互式白板。
The teacher wrote a reminder on the blackboard for tomorrow's test.
老师在黑板上写下明天考试的提醒。
The students took turns writing important points on the blackboard during group discussions.
在小组讨论中，学生们轮流在黑板上写下重要观点。