heardon是什么意思

　　例句：

　　Ann had heard enough of this.

　　安這種話已經聽夠了。

　　I heard a child sobbing loudly.

　　我聽見有個孩子在嗚嗚地哭。

　　He heard the screech of brakes.

　　他聽到了剎車的尖而刺耳聲。

　　Whoever heard of such a thing!

　　究竟有誰聽說過這種事！

　　I've never heard of the place.

　　我從來沒聽說過這個地方。