BIS

例句：

1. 1. The two books are about the same size.
   这两本书大小差不多。
2. 2. He has a double life as a doctor and a musician.
   他既是医生又是音乐家，过着双重生活。
3. 3. They have a double wedding, with two different brides.
   他们举办了一场双重婚礼，有两个不同的新娘。