Take an empty two-liter soda bottle, wash it out, fill it with water, screw the lid on tightly and set it into your toilet tank, as far away from the flapper valve as possible.
拿一个两升的空汽水瓶，洗干净，装满水，旋紧盖子，放进马桶的水箱里，离舌形阀越远越好。
What you will need: an empty plastic soda bottle, a small nail, pliers and some water.
实验所需：一个空的塑胶汽水瓶，一根小钉子，钳子和一些水。
What you will need: an empty plastic soda bottle, a small nail, pliers and some water.
实验所需：一个空的塑胶汽水瓶，一根小钉子，钳子和一些水。
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