消化管代表了一条穿过整个生物体的管道。

Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people will die tomorrow night, so don't give up today.

Chemistry is the science of matter, but I prefer to see it as the science of change.

书籍可能是危险的。最好的那些应该被贴上“这可能会改变你的人生”的标签。

我不害怕失败，我害怕不去尝试。