Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
sustainable – adj. involving methods that do not completely use up or destroy natural resources
philanthropist – n. a wealthy person who gives money and time to help make life better for other people
stem cell – n. a simple cell in the body that is able to develop into any one of various kinds of cells (such as blood cells, skin cells, etc.)
sample – n. a small amount of something that is given to people to try
shift – v. to change or to cause (something) to change to a different opinion or belief
consumption – n. the act of eating or drinking something
