在下雨期间的英语可以用 "during a rainstorm" 或 "during rain" 表示。
"During" 是一个介词，意思是 "在……期间"，常常用来表示时间。例如：
During the day, the sun shines brightly. (在白天，太阳灿烂地照耀着。)
During the night, the moon and stars come out. (在夜间，月亮和星星就出现了。)
"Rainstorm" 是一个名词，意思是 "暴风雨"。例如：
The rainstorm lasted for hours, causing flooding in some areas. (暴风雨持续了几个小时，导致一些地区的洪水。)
The wind was so strong during the rainstorm that it knocked over some tree branches. (暴风雨期间风力很强，甚至把一些树枝刮倒了。)
这里是一些例句：
I stayed inside during the rainstorm to stay dry. (我在暴风雨期间呆在室内，以保持干燥。)
During rain, it's important to carry an umbrella to protect yourself from getting wet. (在下雨期间，携带伞是很重要的，可以保护你不被淋湿。)
"During" 是一个介词，意思是 "在……期间"，常常用来表示时间。例如：
During the day, the sun shines brightly. (在白天，太阳灿烂地照耀着。)
During the night, the moon and stars come out. (在夜间，月亮和星星就出现了。)
"Rainstorm" 是一个名词，意思是 "暴风雨"。例如：
The rainstorm lasted for hours, causing flooding in some areas. (暴风雨持续了几个小时，导致一些地区的洪水。)
The wind was so strong during the rainstorm that it knocked over some tree branches. (暴风雨期间风力很强，甚至把一些树枝刮倒了。)
这里是一些例句：
I stayed inside during the rainstorm to stay dry. (我在暴风雨期间呆在室内，以保持干燥。)
During rain, it's important to carry an umbrella to protect yourself from getting wet. (在下雨期间，携带伞是很重要的，可以保护你不被淋湿。)