Biuniqueness
双向单一性
🗣️ 情景例句
He wrote some nice articles on Mom
他写了一些介绍妈妈的好文章
Go three blocks and make a right. It's right there.
过3个街区，然后往右拐。那里就有个邮局。
We've got to think of ways of changing people's habits.
我们得想想办法，改变人们的习惯。