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一朝被蛇咬，十年怕草繩 Once bitten, twice shy.
一言既出，駟馬難追 A word spoken is past recalling.
一見鍾情 to fall in love at first sight
一箭雙鵰/一舉兩得 Kill two birds with one stone.
一寸光陰一寸金 Time is money.
一失足成千古恨 The error committed on impulse may turn out to be the sorrow of a whole life.
一將功名萬古枯 What millions died that Caesar might be great.
一年之計在於春，一日之計在於晨 Plan your year in spring and your day at dawn.
一人難稱百人意 You cannot please everyone.
一氣呵成 Never make two bites of a cherry.
一白遮三醜 A white complexion is powerful enough to hide seven faults.
一知半解 A little knowledge is a dangerous thing.
一心一意 John is a person who always works with undivided attention.
一丘之貉 These people are cut from the same cloth./are tarred with the same brush.
一目了然 His words just leapt to the eye. Do you need me to explain it?
一帆風順 His business has gone off without a hitch.
一刻千金 You have to make good use of time. After all, every time counts.
一事無成 I am happy to know that all have ended in smoke about him.
一敗塗地 The outcome of the election just bit the dust.
一針見血 His comment on the current affairs always hits the right nail on the head.
一清二楚 The accounts don't seem to be as clear as crystal.
一意孤行 That boy is always going her own way. He won't listen to his parents' advice.
一落千丈 My son's schoolwork has gone to pot. He really lets me down. 一鳴驚人 His performance at school really comes as a bombshell.
一諾千金 He never goes back on his word. He is as good as his word.
一時興起 Don't always do things by fits and snatches.
一蹴可及 You should know that it is impossible to make it at one stroke.
一籌莫展 I really have no idea what to do. Now I am at my wit's end.
一覽無遺 If you stand here looking down at the city. The wonderful scene will be in full view.
一竅不通 What you said is all Greek to me.