telltale

adj.泄露内情的；搬弄是非的；无法掩饰的；报警的

n.告密者；迹象；指示器；[体]发球限制线

The telltale smell of cigarettes told her that he had been in the room. 那股明显的香烟味告诉她，他曾在这房间里呆过。

I could see from the telltale look in her eyes that she loved him. 我从她那无法掩饰的眼神里可以看出她爱他。

The teacher did not notice that I was cheating until that rotten telltale told her. 在那个该死的告密者告诉老师之前，老师并没有注意到我作弊。