消化管代表了一条穿过整个生物体的管道。

When we speak of 'meaning' a word， we are in the first instance speaking of a certain kind of act.

You see,poetry can come from anything with the stuff of revelation in it.

我们都是自己记忆的囚徒。

科学的进步不仅依赖于知识的积累，还需要有挑战未知的勇气。