Biuniqueness
双向单一性
🗣️ 情景例句
I'm having some trouble keeping food down.
我吃东西时感到困难。
I swear!
我发誓！
The former method simply consists of setting an elephant to work and beating him until he does what is expected of him.
强硬法就是驱使象去干活，把它打到顺从为止。