Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
desk – n. a work surface; a place where one sits and works
focus – v. to direct your attention or effort at something specific
leisure - n. time when you are not working : time when you can do whatever you want to do
recommend – v. to propose or suggest
vigorous - adj. done with great force and energy
snack - n. a small amount of food, usually eaten between meals
risk factor – n. something that increases one's risk
stairs – n. a series of steps for moving from one level to the next
elevator – n. a device that raises or lifts something up
beneficial – adj. helpful; useful
