Why waste valuable teaching time trying to knock in a list of facts, if the children aren't interested.

既然孩子们对罗列的事实不感兴趣，为什么要浪费宝贵的教学时间强行塞给他们呢?。

I carefully picked up one egg , lightly knock in Wan Yan on a few times, get up and look, Dan Pi is not broken.

我小心翼翼地拿起一个鸡蛋，轻轻的在碗沿上磕了几下，拿起来一看，蛋皮没有破。

The United centre-back ended the game with a heavy limp after suffering the knock in the latter stages of the win.

这位曼联的中后卫在后阶段受到一次碰撞，最后是一瘸一拐地结束了比赛。