登录
the thin sheets on which one can write, draw, or print things, also used as wrapping material
纸
a small furry animal with rounded ears, short legs and no tail, which is often kept as a pet or for research
豚鼠, 天竺鼠
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 part of a photograph, etc. that is situated behind the main figures, etc.
背景, 后景
a road vehicle that has four wheels, an engine, and a small number of seats for people
汽车, 轿车
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
a group of individuals who share similar economic, cultural, and educational status
社会阶层, 社会阶级
