as dead as a doornail

例句：

1. 1. The old man looked so frail that he could hardly walk.
   老人看起来很虚弱，几乎走不动路。
2. 2.His speech was so monotonous that it was as dead as a doornail.
   他的讲话单调乏味，简直就像死一样的。
3. 3.The garden was overgrown with weeds, making it as dead as a doornail.
   花园被杂草覆盖，已经毫无生机了。