go sink into a decline的用法和樣例：
例句
- In the late forties he started to sink.
到四十年代末，他開始衰落了。 - On the eve of Anti-Japanese War, transportaion had been impeded, and began to decline.
發展到抗日戰爭前夕，馬幫運輸受到阻礙，開始衰落。 - There was a serious slump in the 1930s.
二十世紀三十年代發生過嚴重的經濟衰退。 - Theories abound for the decline of the sitcom.
市面上充斥著對於情景喜劇衰退的種種看法。
