heardon是什么意思

　　例句：

　　Ann had heard enough of this.

　　安这种话已经听够了。

　　I heard a child sobbing loudly.

　　我听见有个孩子在呜呜地哭。

　　He heard the screech of brakes.

　　他听到了刹车的尖而刺耳声。

　　Whoever heard of such a thing!

　　究竟有谁听说过这种事！

　　I've never heard of the place.

　　我从来没听说过这个地方。