A 15-year lifespan is not uncommon for a dog.15年的寿命对狗而言是比较常见的。Most boilers have a lifespan of 15 to 20 years.绝大多数锅炉有15至20年的使用期限。Worms have a lifespan of a few months.蠕虫的寿命为几个月。...
A 15-year lifespan is not uncommon for a dog...15年的寿命对狗而言是比较常见的。They postulated a 500-year lifespan for a plastic container.他们假定塑料容器的寿命为500年。Most boilers have a lifespan of 15 to 20 years.绝大多数锅炉有15至20年的使用期限。The average l...