你别半途而废。
You should finish what you start.
I'm going to give up. (我想放弃了。)
You should finish what you start. (你别半途而废。)
Don't leave things half done. *也可用half done来表示“半途而废”。
我认输了。
I'm ready to throw in the towel. *这是一句拳击用语，用来比喻“认输”。
You failed the exam again. (你又没考上。)
I'm ready to throw in the towel. (我认输了。)
这是你(应尽)的责任。
It's your duty (to do that). *duty “(法律、道德上的)义务，应尽的责任”。
It's up to you to do that. (这是你应该做的。)
It's your responsibility. (这是你分内的工作。)
要善待他人。
Be good to others.
Do unto others as you would have done to you.*正式的说法。
You should treat others kindly¹.
Do unto others.
你要再三小心。
You can't be too careful. *直译“再小心也不为过”。
You can't be too careful. (你要再三小心。)
That's true. (那是当然。)
It's best to be as safe as possible.
(It's) better safe than sorry. (保得安全总比后悔好。)
三思而后行。
Make up your mind after thinking it over carefully. *make up one's mind 常用词组，表示decide(下决心)。带有“仔细考虑之后再下决定”的语感。
Make your decision after you give it a lot of thought.
Think it over carefully before you decide.
我全靠你了。
I'm counting on you. *这句表示“我全仗你了，你好好干”。
I'm relying on you.
你终究会明白的。
You'll see.
I don't think she's mean. (我没觉得她有什么恶意。)
You'll see. (你终究会明白的。)
You'll find out soon enough.
Time will tell. (时间会证明一切。)
冷静下来好好想想。
Calm down and think carefully. *calm down “冷静”、“镇静”。
Calm down and think carefully. (冷静下来好好想想。)
I can't! (我做不到。)
Calm down and think about it clearly.
这是最重要的事情。
That's the most important thing.
We need to know who's buying our products. (我们需要弄清楚谁买了我们的商品。)
That's the most important thing. (这是最重要的事情。)
That's the name of the game.
人要有自知之明。
Don't bite off more than you can chew. *bite off more than one can chew 直译是“咬下了自己嚼不了的东西”，常用来表示“接受自己力所不及的工作”、“接受超过自己能力的事情”。
Don't attempt more than you are capable² of.
这事做起来没有太大价值。
There isn't much merit³ in doing so.
There is no reason to do so.
I don't see the point (of doing that).
你还得再加把劲儿。
What you need is a little more effort. *effort “努力”、“尽力”。
You should put a little more effort into it. (你应该再加一把劲儿。)
You should try a little harder. (你应该再努力一点儿。)
有点自尊心吧!
Respect yourself.
我希望你事事要积极。
I hope you'll be more positive overall⁴. *positive “积极的”。
I don't think I can do it. (我觉得我做不了。)
I hope you'll be more positive overall. (我希望你事事要积极。)
I hope you'll be more positive in every way.
I wish you'd be more positive.
You should be more optimistic. (希望你能乐观点儿。) *optimistic “积极的”、“乐天派的”。
你说得容易。
That's easy for you to say.
If you practice hard, you'll get a gold medal. (如果你刻苦练习，一定能够得金牌。)
That's easy for you to say. (你说得容易。)
你发什么牢骚?
There's no reason for complaints. *complaint “不满”、“抱怨”、“诉苦”。
There is no reason to complain.
There is nothing to complain about.
你脸上都写着呢呀!
It's written all over your face.
Did you pass the exam? (考试都通过了?)
How did you know? (你怎么知道的?)
It's written all over your face. (你脸上都写着呢呀!)
It's obvious. (明显地能看出来。) *obvious “一眼就能看出来的，明显的”。
I can see it in your eyes. *你的眼睛告诉了我。
我当然会生气了。
It's natural for me to get angry. *It's natural for...to “当然(自然)会”。
Why shouldn't I be angry?
I have a right to be upset!
My reaction is completely appropriate. (我这样的反应是自然的。) *appropriate “与目的、条件等相称的，适合的，恰当的”。
我是根据我的经验才这样说的。
I'm telling you this from my experience.
Are you sure about it? (确实是这样吗?)
I'm telling you this from my experience. (我是根据我的经验才这样说的。)
Let me offer you some advice. From my experience... (我给你一个建议，据我的经验来看……)