粒子的概念只是一种近似，仅在特定极限情况下有效。

"Writing is a way of speaking without being interrupted."

人体是生物工程的杰作。

可持续性不是一种趋势，而是我们对后代的责任。

The best performance improvement is the transition from the nonworking state to the working state.

释义：征服世界易，驾驭内心难。