Levulinamide
4-氧(代)戊酰胺
🗣️ 情景例句
It's almost lunchtime, and no fish yet.
差不多到午餐时间了， 还没钓到鱼。
Look before you leap.
三思而后行。
Tony speaks English and he plays tennis.
托尼会说英语，打网球。