Learning is essentially a matter of stimulus-response connections.

Innovation in oil and gas is not a choice; it is a necessity for sustainable development.

衣食是人们活着的时候所需要的利益，尚且要有一定的节制；埋葬是人们死后所需要的利益，为什么就单单在这里没有节制呢？ 

Transparency builds trust, and trust builds lasting relationships with consumers.