Toupper
小写字母转换成大小字母
🗣️ 情景例句
It's for a book.
是为一本书拍的。
Nothing is more precious than time.
世上最宝贵的莫过于光阴。
He waved desperately to his companion, who had been water skiing for the last fifteen minutes.
他绝望地向他的伙伴挥手，他的伙伴在过去的15分钟里一直在滑水。