The flexing action of the sleeve not only unplugs the valve, but also breaks up the lime.
套管的弹性作用不仅不会堵塞阀门，还能够碎裂固化的石灰。
2
To get smaller kids involved, create a sticker chart and place a sticker on the chart each time a child turns off or unplugs an electronic device or light that is not in use.