A few months later, he worked hard on a small blackboard chalk, and finally succeeded.

几个月后，他用一块小黑板苦练粉笔字，终于成功。

youdao

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

他用一截粉笔将她的指示写在黑板上。

youdao

The chalk rasped across the blackboard.

粉笔划过黑板发出刺耳的声音。

youdao

The odor of sweat, leftover food, and blackboard chalk filled the air.

NEWYORKER: Waiting

If you ask most people, they'd tell you there's nothing wrong with the standard classroom set-up of a blackboard and chalk, or a whiteboard and dry-erase markers.

ENGADGET

Unless bad schools are indeed closed, his scheme will be as much good as a blackboard with no chalk.

ECONOMIST: School reform