twinning
n. 孪生，成对；双晶形成
v. 使结成姊妹城市；使结成友好地区；使（两人或两事物）紧密结合；使耦合；使相连（twin 的现在分词）
例句
I would encourage everyone to start twinning!
“我会鼓励每一个人开始”双生行动“！”
Formed by the process of twinning. Used of crystals.
孪晶由孪晶过程形成的。用于晶体。
Identical twinning can begin only inside the Fallopian tube.
同卵孪生可能只在输卵管内开始发育。
