translation.en: Now solving this puzzle was not an easy thing, because we produce hundreds of different chemicals on the skin, but we undertook some remarkable experiments that managed us to resolve this puzzle very quickly indeed.
translation.zh: 解决这个问题可要花不少工夫 因为我们的皮肤制造上百种不同的化学物质 但我们完成了一些了不起的实验 帮助我们迅速厘清了解开难题的关键