- 1樓梯（尤指室內含扶手、結構的整座樓梯）
A staircase is a whole set of inside a building, thought of as one built object — the steps themselves plus the frame that holds them up and the rail or side wall you put your hand on. That 'whole thing' feeling is the key. If you say 'be careful on the ', you mean the steps you are walking on; if you say 'a beautiful wooden staircase', you mean the structure as a piece of the house, something a carpenter made. So we talk about a spiral staircase, a marble staircase, a staircase that curves down into the hall. In ordinary talk, though, people say 'the ' far more often, and 'staircase' comes out mainly when the thing itself is being described or admired — in stories, in house advertisements, in tours of old buildings. In American English you will also hear 'stairway' with much the same meaning. One small caution about buildings in Taiwan: the concrete in an apartment block are usually the 樓梯 everyone just calls 'the ', and the shaft they run through is the , not the staircase.
From the word’s history
From stair + case.
由 stair 加上 case 組成。
組成stair（一階、樓梯）+ case（外殼、框架）. 'Stair' goes back to Old English stǣġer, from a very old root meaning 'to climb'. 'Case' here is the old sense of a frame or box that encloses something — like a bookcase — so a staircase is 'the frame that holds the stairs'.
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
staircasenoun/ˈstɛɹˌkeɪs/
- 1
A flight of stairs; a stairway.
- I was on the staircase by the bell / Blinded by the black magician's spell
- 2
A connected set of flights of stairs; a stairwell.
- Turning back, then, toward the basement staircase, she began to grope her way through blinding darkness, but had taken only a few uncertain steps when, of a sudden, she stopped short and for a little stood like a stricken thing, quite motionless save that she quaked to her very marrow in the grasp of a great and enervating fear.
- When Timothy and Julia hurried up the staircase to the bedroom floor, where a considerable commotion was taking place, Tim took Barry Leach with him. He had him gripped firmly by the arm, since he felt it was not safe to let him loose, and he had no immediate idea what to do with him.
- 3
A set of locks (enclosed sections of waterway) mounted one above the next.
staircaseverb/ˈstɛɹˌkeɪs/
- 1
To modify (a signal, a graph, etc.) to reduce a smooth curve to a series of discrete steps.
- This leads to much smoother reconstructions in regions of moderate gradient and thus prevents staircasing.
- 2
businessreal-estateTo increase one's share in a co-ownership.
- It is a good idea to make plans for staircasing when you first buy your shared ownership home.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。