twin births

例句：

1. 1. Twin births are a rare and beautiful phenomenon.
   双胞胎出生是一种罕见的美丽现象。
2. 2. The twin births of the twins were a source of great joy for their parents.
   这对双胞胎的出生给父母带来了极大的喜悦。
3. 3. Twin births are often associated with multiple pregnancies and can be challenging for both mother and child.
   双胞胎出生通常与多次怀孕有关，对母亲和孩子来说都是具有挑战性的。