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hemisphere – n. a half of the Earth, usually divided between the northern and southern halves
emphasize –v. to give special importance or attention to something
razor's edge –n. a dangerous position in which two different things are carefully balanced
respiratory –adj. related to breathing and the lungs
humid –adj. when there is a lot of gaseous water in the air
skyrocket –v. to go up or increase at a very fast rate
anticipate –v. to expect something to happen in the future
dose –n. an amount of a medicine needed to give a good result
mild –n. not severe or strong
