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Board: to get on a ship, train, plane, bus, etc. 上船（或火車、飛機、公共汽車等）
The ship was boarded by customs officials.
海關官員登上了這艘船。
Passengers are waiting to board.
乘客們正在候機。
Maintenance: the act of keeping sth in good condition by checking or repairing it regularly 維護；保養 ~ (of sth) uncountable
The school pays for heating and the maintenance of the buildings.
學校負擔這些大樓的供熱和維修費用。
car maintenance
汽車保養
Turbulence: a series of sudden and violent changes in the direction that air or water is moving in （空氣和水的）湍流，渦流，紊流
We experienced severe turbulence during the flight.
我們在飛行中遇到了強烈的氣流。
Nightmare: an experience that is very frightening and unpleasant, or very difficult to deal with 可怕的經歷；難以處理之事；噩夢 ~ (for sb)
The trip turned into a nightmare when they both got sick.
這次旅行成了一場噩夢，他們倆都病了。
Nobody knows what's going on─it's a nightmare!
誰也不知道是怎么回事 真是棘手至極！
Filling in all those forms was a nightmare.
填寫了那么多的表格，真是太可怕了。
Losing a child is most people's worst nightmare.
對于大多數人來說，喪子之痛是最可怕的夢魘。
