A new technoitemy is being introduced: this is a plastic strip that will change color when peed upon. (This seems to me like a reasonable next step.

 
  • 一種技術(shù)被提出:有一種塑料條,當撒尿到上面時(shí)會(huì )改變顏色。(我認為這么做是合理的。
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