one of two children or animals born at the same birth.
Fun Fact:
Even if the twins are identical, they do not have identical fingerprints.
Example Sentence:
哦，我知道，就是双塔跳楼机，这个太刺激，我不敢玩儿。
ò，wǒ zhīdào，jiùshì shuāngtǎtiàolóujī，zhège tài cìjī，wǒ bù gǎn wánr。
Oh, I know. It’s the Twin Tower Drop. It’s too exciting. I don’t dare go on it.