translation.en: And then while we were doing this, the shape of the bottle upside down reminded us of a Y, and then we thought, well these words, "why" and "why not," are probably the most important words that kids ask.
translation.zh: 当我们正在做这个时， 瓶子颠倒的形状让我们想到Y， 于是我们想到 why、why not 可能是孩子们最重要的疑问词。