expedition — a long journey organized for a special purpose, such as exploration or research., The scientists went on an expedition to Antarctica., sanitation — systems and practices that keep places clean and protect people's health., Good sanitation helps prevent diseases., hygiene — habits and conditions that help people stay clean and healthy., Personal hygiene is important for good health., long-lasting — continuing for a long time without wearing out or ending., This battery is long-lasting and works for many hours., sustainable — able to continue for a long time without harming the environment or using up resources., Solar energy is a sustainable source of power., fellow — a person who belongs to the same group, team, or community as you., My fellow students helped me with the project., set off — to begin a journey or trip., We set off early in the morning., trek — a long and often difficult journey, usually on foot., They completed a three-day trek through the mountains., induction — the process of introducing and training someone when they start a new job, course, or activity., New employees attend an induction on their first day., hospitality — friendly and generous treatment of guests or visitors., The family showed great hospitality to their guests., handwashing station — a place with water, soap, and facilities where people can wash their hands., There is a handwashing station near the entrance of the school.

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