twinning

动词 twin:

1. duplicate or match
   同义词：twin, duplicate, parallel
2. bring two objects, ideas, or people together
   同义词：match, mate, couple, pair, twin
3. grow as twins
   同义词：twin
4. give birth to twins
   同义词：twin

形容词 twinning:

1. producing two offspring at a time
   同义词：biparous

1. I can't tell the twins apart.
   我辨认不出这对双胞胎。
2. Formed by the process of twinning. Used of crystals.
   孪晶由孪晶过程形成的。用于晶体