Jet-black means a very deep, shiny black — as dark as jet, a hard black stone people once used for beads and jewellery.

Jet-black means a very deep, shiny blackjet-black指的是很深、有光澤的黑 — as dark as jet像jet（煤玉）一樣黑, a hard black stone people once used for beads and jewellery那是一種人們以前拿來做珠子和珠寶的堅硬黑色石頭

It is a colour word, not a darkness word: you say jet-black hair, a jet-black car, jet-black feathers.

It is a colour word, not a darkness word這是個顏色詞，不是形容黑暗程度的詞: you say jet-black hair, a jet-black car, jet-black feathers你會說jet-black hair烏黑的頭髮、a jet-black car烏黑的車、jet-black feathers烏黑的羽毛

Pitch-black is the cousin people mix it with; that one is more about a room or night so dark you cannot see. Jet-black can still have a little shine, like polished stone.

Pitch-black is the cousin people mix it withpitch-black是常被搞混的近親詞; that one is more about a room or night so dark you cannot see那個詞比較是在說房間或夜晚黑到看不見. Jet-black can still have a little shinejet-black還是可以帶點光澤, like polished stone像磨亮的石頭那樣

Everyday talk often just says really black; jet-black sounds a bit careful, even a little literary, the kind of thing you write or say when you want the colour to feel rich. Always the hyphen in careful writing.

Everyday talk often just says really black日常說話常常就直接說really black; jet-black sounds a bit careful, even a little literaryjet-black聽起來比較講究，甚至有點文學味, the kind of thing you write or say when you want the colour to feel rich是你想讓那個顏色顯得濃郁時會寫或說的詞. Always the hyphen in careful writing講究的寫法裡一定要加連字號

And this jet is not the aeroplane: same spelling, different story.

And this jet is not the aeroplane而這裡的jet不是指飛機: same spelling, different story拼法一樣，來歷不同