If a wall, a door, or a room is panelled, it is covered or decorated with flat pieces of wood fitted together. The wood is not just painted on; it sits on the surface in squares or long boards, often with thin frames around each piece.

If a wall, a door, or a room is panelled如果一面牆、一扇門，或一個房間是panelled的 it is covered or decorated就是被鋪上或裝飾了 with flat pieces of wood fitted together拼接在一起的平整木片 The wood is not just painted on木頭不是只是畫上去的 it sits on the surface而是真的鋪在表面上 in squares or long boards排成方塊或長條的木板 often with thin frames around each piece常常每片周圍還有細細的框

You hear this about old dining rooms, courtrooms, and ships: a panelled room feels warm, heavy, and rather formal.

You hear this about old dining rooms, courtrooms, and ships你會聽到這個詞用在老式餐廳、法庭，和船艙上 a panelled room一個panelled的房間 feels warm, heavy, and rather formal感覺溫暖、厚重，而且相當正式

Though actually, people now use it for other materials too — a leather-panelled door, for example — but the first picture in a learner’s book is still wood.

Though actually不過其實 people now use it for other materials too現在人也會拿它形容其他材質 a leather-panelled door, for example比如說一扇leather-panelled（鑲皮）的門 but the first picture in a learner's book但學習者第一個該想到的畫面 is still wood還是木頭

It is mainly a British spelling; American books usually write paneled, with one l. Same word, same meaning.

It is mainly a British spelling這主要是英式拼法 American books美式書籍 usually write paneled, with one l通常寫成paneled，只有一個l Same word, same meaning同一個字，同一個意思