1. Some reptiles reproduce oviparously, while others reproduce viviparously.
一些爬行动物以卵生方式繁殖，而其他一些以胎生方式繁殖。

2. The kangaroo is a well-known example of a mammal that reproduces viviparously.
袋鼠是一个以胎生方式繁殖的著名哺乳动物的例子。