我快活自由，身体健康，积极乐观。I am happy and free, in good health, gay and cheerful.女孩子们拿着桶和铲子在沙滩上快活地玩耍。The girls happily played in the sand with buckets and spades.我正过得开心快活着呢.I'm having a rollicking good time....
如果汽车采用更多塑料元件，寿命会更长一些。If you build more plastics into cars, the car lasts longer.这些电池的寿命为6小时。The batteries had a life span of six hours.15年的寿命对狗而言是比较常见的。A 15-year lifespan is not uncommon for a dog....