It's a sure sign of economic recovery.

这是经济复苏的确切迹象。

Sharpe's leg and shoulder began to ache, a sure sign of rain.

夏普的腿和肩开始痛了，这是要下雨的准确迹象。

If an interview is too easy, it's a sure sign that you haven't got the job.

如果面试太简单，那必定表示你没得到那份工作。

Guests are returning in increasing numbers – a sure sign that we are on the right track.

回头客越来越多–一个我们做得对的确凿迹象。

Dark clouds are a sure sign of rain.

乌云无疑是下雨的征兆。