twinning

中文： 结为友好城市、产双胞胎、双晶作用

1. The act of producing twins.
2. The act of giving birth to twins.
3. The pairing of similar objects (such as towns).
4. The formation of twin crystals.
5. A type of identity transformation where a subject transforms into a copy or clone of someone else.
6. The conversion of a road into a dual carriageway.

复数 twinnings