Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
hydrated – v. to supply (something) with water – adj. to drink enough water : Remember to stay hydrated.
dehydrated – v. to lose too much water
saliva – n. the liquid produced in your mouth that keeps your mouth moist and makes it easier to swallow food
thirst – n. an uncomfortable feeling that is caused by the need for something to drink
athlete – n. a person who is trained in or good at sports, games, or exercises that require physical skill and strength
carbohydrate – n. any one of various substances found in certain foods (such as bread, rice, and potatoes) that provide your body with heat and energy and are made of carbon, hydrogen, and oxygen
mood – n. the way someone feels : a person's emotional state
focus – v. to direct your attention or effort at something specific
fluid – n. capable of flowing freely like water
muscle cramp – medical noun A muscle cramp is a strong, painful contraction or tightening of a muscle that comes on suddenly and lasts from a few seconds to several minutes. It often occurs in the legs.
