突然下用英语怎么说？

突然下

Suddenly.

例句

• The value of the pound swung downwards. 英镑的价值突然下跌。
• They were taking a promiscuous stroll when it began to rain. 他们正在那漫无目的地散步,突然下起雨来.
• The match had just begun when the heavens opened and play was suspended. 比赛刚刚开始就突然下起倾盆大雨，所以只好暂停了。
• Last year, sales went through the floor. 去年，销售突然下滑。
• ...a path which suddenly dips down into a tunnel. 突然下降进入一条隧道的小路