You should renew the water in the fish tank once a week.你应该每周给鱼缸换一次水。Josh was scrubbing out the fish tank.乔希正在清洗鱼缸。It was my job to wash out the fish tank.我的工作是清洗鱼缸内壁。Help me figure out the volume of this fish tank.帮我算一算这鱼缸的容积。I cleaned out the fish tank today.今天我清理了鱼缸。