Biuniqueness
双向单一性
🗣️ 情景例句
How do you spell it?
如何拼写？
Score twice before you cut once.
三思而行。
This is a major achievement because, in relative terms, planets are very small and old not emit light.
这是一个重要的成就，因为相对来说，行星很小，而且也不发光。