Lucy says that each of them tries "to keep the sink, tub, and the toilet clean." The sink, "sink," is where you put the water - where you pour the water into in order to clean. A tub, "tub," sometimes called a bathtub, is a place where you put water. It's usually a long box in your bathroom that you put water into it and you then get into the water and you clean yourself, kind of like when you go swimming. You go in - your whole body goes into the water. Well, that's what a tub is, it's a large, long container that you put water into in order to take a bath. A toilet, "toilet," is what you use when you go to the bathroom, when you get rid of things out of your body.
露西说她们“用完洗手盆、浴缸还有马桶之后都会及时打扫，保证干净。”洗手盆（sink）是放水的器皿，你可以往里边放水来洗漱。浴缸（tub）也叫澡盆，也是放水的器皿。浴缸通常是一个长盒子形状的东西，放在卫生间里，你可以往里边放水，然后下水洗澡，有点像游泳。你进去之后，全身都泡在水里。这就是浴缸，是很大很长的一个容器，你可以往里边放水洗澡。马桶（toilet）在卫生间里，是上厕所用的。
