A turnstile is the gate at an entrance that spins, with arms like the spokes of a wheel, letting exactly one person through at a time.

A turnstile is the gate at an entrance that spinsturnstile是入口處會旋轉的那種閘門, with arms like the spokes of a wheel上面的橫桿就像輪子的輻條, letting exactly one person through at a time一次只能讓一個人通過

You meet them at MRT and subway stations, at stadiums, at museums, at swimming pools — anywhere a place needs to check tickets and count heads.

You meet them at MRT and subway stations, at stadiums, at museums, at swimming pools你會在捷運和地鐵站、球場、博物館、游泳池遇到它們 — anywhere a place needs to check tickets and count heads任何需要驗票和計算人數的地方都有

The counting matters: because only one body fits between the arms, the machine knows how many people came in, which is why sports reports talk about turnstile numbers meaning attendance.

The counting matters計數這件事很重要: because only one body fits between the arms因為橫桿之間只容得下一個人, the machine knows how many people came in機器就知道有多少人進來, which is why sports reports talk about turnstile numbers meaning attendance這就是為什麼體育報導會用turnstile numbers來指入場人數

Some are waist-high with three arms; the tall ones that go from floor to ceiling, often at the back gates of a stadium or a factory, get called full-height turnstiles.

Some are waist-high with three arms有些是及腰高、三根橫桿; the tall ones that go from floor to ceiling那種從地板到天花板的高大款式, often at the back gates of a stadium or a factory常見於球場或工廠的後方閘口, get called full-height turnstiles被稱為full-height turnstiles（全高式旋轉閘門）

The word is ordinary and plain — nobody thinks of it as difficult English — and it has spread a little into computers, where a turnstile can mean any gate that lets requests through one by one.

The word is ordinary and plain這個字很普通、很平實 — nobody thinks of it as difficult English沒有人會覺得這是困難的英文 — and it has spread a little into computers它也稍微延伸進了電腦領域, where a turnstile can mean any gate that lets requests through one by one在那裡turnstile可以指任何一次只放一個請求通過的機制