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ADJ
（表示令人满意或可以接受）不错的，可以的
If you say that something is okay, you find it satisfactory or acceptable.
例句
...a shooting range where it's OK to use weapons...
可以使用武器的射击场
Is it okay if I come by myself?...
我一个人来行吗？
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ADJ
（人）安全的，健康的，无恙的
If you say that someone is okay, you mean that they are safe and well.
例句
Check that the baby's okay...
看看孩子是否还好。
'Don't worry about me,' I said. 'I'll be okay.'
“别担心我，”我说，“我不会有事的。”
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CONVENTION
（表示同意）好的
You can say 'Okay' to show that you agree to something.
例句
'Just tell him Sir Kenneth would like to talk to him.' — 'OK.'...
“就跟他说肯尼思爵士想跟他谈谈。”——“好的。”
'Shall I give you a ring on Friday?' — 'Yeah okay.'
“我星期五给你打电话好吗？”——“好的。”
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CONVENTION
（询问对方是否领会或同意）好吗，行吗，明白吗
You can say 'Okay?' to check whether the person you are talking to understands what you have said and accepts it.
例句
Add them together, divide by five, and you've got the average. Okay?...
把它们相加再除以5就是平均数，明白吗？
We'll get together next week, OK?
我们下周聚一聚，好吗？
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CONVENTION
（表示希望转换话题或做别的事情）好了
You can use okay to indicate that you want to start talking about something else or doing something else.
例句
OK. Now, let's talk some business...
好了，我们现在言归正传吧。
Tim jumped to his feet. 'Okay, let's go.'
蒂姆一跃而起，“好了，我们走吧。”
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CONVENTION
（不情愿地表示接受对方观点以制止其争辩）得了，行了
You can use okay to stop someone arguing with you by showing that you accept the point they are making, though you do not necessarily regard it as very important.
例句
Okay, there is a slight difference...
行了，是略有不同。
Okay, so I'm forty-two.
得了，我就算42岁吧。
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VERB
批准；同意；允许
If someone in authority okays something, they officially agree to it or allow it to happen.
例句
His doctor wouldn't OK the trip...
医生不会同意他去旅行。
We are all wondering why the government is suddenly okaying a brand new school on the island.
我们都很疑惑为什么政府突然批准在岛上建一所新学校。