Some come singly, some in groups of two, three, or more.
有的单独一只，有的两三个一群，或者更多。
The earthquake has caused severe damages to the area. However, misfortunes never come singly as the weather is really bad for the salvage.
地震对该地区造成严重破坏。但祸不单行，恶劣的天气给营救工作造成更大困难。
The earthquake has caused severe damages to the area. However, misfortunes never come singly as the weather is really bad for the salvage.
地震对该地区造成严重破坏。但祸不单行，恶劣的天气给营救工作造成更大困难。
应用推荐