Boundaries define us. They define what is me and what is not me. A boundary shows me where I end and someone else begins, leading me to a sense of ownership.

Beware of the Turing tar-pit in which everything is possible but nothing of interest is easy.

In coal, efficiency today defines existence tomorrow.

And when his audience grew bored, he would spring into the air and do a back flip with a half twist.

要完成伟大的事业，我们不仅要行动，还要梦想；不仅要计划，还要相信。

我们开采的每一块石头都诉说着坚持与精确的故事。