"Yesterday wasn't a sunny day" 这句话的英文表达是 "Yesterday wasn't sunny."
"sunny" 这个词来源于中世纪的古英语 "sunne"，意思是阳光充足的。
例句1: "I'm glad the weather is sunny today." 中文翻译："我很高兴今天天气晴朗。"
例句2: "The forecast said it would be sunny tomorrow, but I don't bepeve it." 中文翻译: "天气预报说明天会晴朗，但我不相信。"