人口human population; size of a family
代表representative; on behalf of
全家福photograph of the whole family; hodgepodge
划算calculate; be to one's profit
副作用side effect; secondary action
午睡take a nap after lunch; noontime snooze
失望lose hope/heart/confidence; disappointed
摔跤trip and fall; make a blunder
本stem or root of plants; original
照顾give consideration to; give preferential treatment
甚至even to the extent that; so far as to
矛盾weapons of ancient times with different functions; contradiction
知识knowledge; pertaining to knowledge, learning or culture