解决方案 - 高级 - 单元 7 - 7C

a structure built from a shoreline into a body of water, usually made of concrete or stone, that serves to protect the coast or provide a docking point for boats

码头

a person, typically young, who regularly engages in illegal or immoral behavior

违法者

a device used to amplify sound, typically for public speaking or making announcements

扩音器

to treat someone unfairly or cruelly, often because of their race, gender, religion, or beliefs

迫害

a short-barreled, muzzle-loaded artillery piece that fires explosive shells at high angles for close-range support

迫击炮

a bag for carrying on the back, usually used by people who go hiking or soldiers

背包

the highest degree given by a university

博士学位

made impure or polluted by harmful substances, bacteria, or viruses

污染的

a small boat made of rubber or wood that It is used for fun or to travel short distances

小艇

deeply unhappy or dejected

无可慰藉的