Aldehydene
乙炔
🗣️ 情景例句
So save your voices till then.
所以， 留着点嗓子。
A road of a thousand miles begins with one step.
千里之行始于足下。
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。