Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
customer – n. person who buys goods or services from a business
source – n. someone or something that provides what is needed
braking – n. system used for slowing or stopping
carbon footprint – n. amount of carbon dioxide produced by people, companies or organizations
contribute – v. help cause something to happen
ambitious – adj. desire to be successful or powerful
commitment – n. promise to do something
high-end - adj. of high quality and usually high in price
