一朝被蛇咬，十年怕草绳
Once bitten, twice shy.
一言既出，驷马难追
A word spoken is past recalling.
一见钟情
to fall in love at first sight
一箭双鵰/一举两得
Kill two birds with one stone.
一寸光阴一寸金
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.
一将功名万古枯
What millions died that Caesar might be great.
一年之计在于春，一日之计在于晨
Plan your year in spring and your day at dawn.
一人难称百人意
You cannot please everyone.
一气呵成
Never make two bites of a cherry.
笔记：
on impulse：一时冲动，一时心血来潮
turn out：结果是， 证明是
一白遮三丑
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?
一帆风顺
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.
一事无成
I am happy to know that all have ended in smoke about him.
一败涂地
The outcome of the election just bit the dust.
一针见血
His comment on the current affairs always hits the right nail on the head.www.ExamW.CoM
笔记：
undivided attention：一心一意
go off：进行，响起，入睡，变质
without a hitch：顺利无阻地(轻易地)
bit the dust：倒下死去(一败涂地, 受辱)
comment on：对 ... 评论
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