书籍 Summit 1A - 第 5 单元 - 第 4 课

unpaid work done either as a form of punishment by a criminal or as a voluntary service by a citizen

something that a person spends time doing, particularly to accomplish a certain purpose

to make something more beautiful or attractive, typically by adding decoration or enhancing its appearance

an area with human population that is smaller than a city and larger than a village

to make oneself neat or clean

waste such as bottles, papers, etc. that people throw on a sidewalk, park, or other public place

to assemble money or resources, particularly in order to achieve or create something

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

to state or suggest something without being asked or told

the quantity that is measured in seconds, minutes, hours, etc. using a device like clock

to freely give goods, money, or food to someone or an organization

the red liquid that the heart pumps through the body, carrying oxygen to and carbon dioxide from the tissues