the thin sheets on which one can write, draw, or print things, also used as wrapping material

纸

a protective system in the body that defends it against diseases and harmful substances

免疫系统, 免疫机制

(genetics) a basic unit of heredity and a sequence of nucleotides in DNA that is located on a chromosome in a cell and controls a particular quality

基因, 遗传基因

the process that involves teaching and learning, particularly at a school, university, or college

教育

people that are related to each other by blood or marriage, normally made up of a father, mother, and their children

家庭

something that we use to buy and sell goods and services, can be in the form of coins or paper bills

钱, 货币

all the qualities that shape a person's character and make them different from others

个性, 性格

one's ability to say funny things or be amused by jokes and other things meant to make one laugh
to make our mouth curve upwards, often in a way that our teeth can be seen, to show that we are happy or amused

微笑

