书籍 Solutions - 中高级 - 单元 4 - 4G

the feeling of being uninterested or restless because things are dull or repetitive

a state of being free from pain, worry, or other unpleasant feelings

the state of being helpful or useful for a specific situation

an amount we pay to buy, do, or make something

suitcases, bags, etc. to keep one's clothes and other belongings while traveling

the condition of being protected and not affected by any potential risk or threat

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

a feeling of nausea and dizziness caused by motion, especially during travel in a vehicle like a car, boat, or plane