You can't change the past, but you can shape the future.

The strength of a response tendency depends on the amount of reinforcement received.

This world is filled with ups and downs. Take turns lending a helping hand in times of need. That's as it should be.

永远不要停止学习，一旦停止，你就会落后。

我们不会给你写分手情歌

Technology will continue to revolutionize how we extract and utilize natural gas.

Success is not final, failure is not fatal: It is the courage to continue that counts.