S. op. s.
[医] 必要时
🗣️ 情景例句
Don't be lazy, the older you get, the harder it will be to learn.
别偷懒，年纪越大，学起来就越难。
Thank you for coming.
谢谢你光临。
The development of the modern beehive in 1851 made it possible to design experiments to research the language of honey bees.
1851年现代蜂箱研制出来后，这才有可能来设计实验，研究蜜蜂的语言。