"也是多云"的英文表达是 "also mostly cloudy"。

"多云" (duō yún) 是指天气状况中云层覆盖面积很大,但不会有很多雨或雪。在英文中,"cloudy" 是指天空中有很多云,但没有下雨或下雪。当天气状况为 "mostly cloudy" 时,意思是天空中有大部分是云,但也有少量晴空。

例句:

"The forecast for tomorrow is mostly cloudy with a chance of showers in the afternoon." (明天的天气预报是大部分多云,下午有小雨的可能性。)
"It was a mostly cloudy day, but the sun managed to peek through the clouds now and then." (今天大部分是多云,但阳光偶尔也会从云层中间突然出来。)