Science demands from a man all his life.
科学要求一个人付出他的一生。
Hunger and poverty are the root causes of much of the world's unrest and misery.
"We are all prisoners of our own experiences, and yet we can never fully understand them."
The most rewarding part of my job is seeing our medicines make a difference in people's lives.
孩子不是涂色本，你不能随心所欲填上自己喜欢的颜色。
文章是用来承载道理的，不仅仅是为了观赏美观。