Learner's definition of NONE
: not any of a group of people or things : no amount or part of something一个也没有；一点儿也没有 -
None of this was necessary.这个一点儿也不必要。
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Why are all the guests standing in the kitchen and none sitting in the living room?为什么所有客人都站在厨房里，没一个坐在客厅里？
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Half a piece is better than none.半个总比没有强。
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The frozen yogurt tastes like ice cream but has none of the fat (that ice cream has).冰冻酸奶吃起来就像是冰激凌，却不含任何脂肪。
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Though the languages are related they share almost/virtually none of the same vocabulary.尽管这些语言有关联，但它们几乎/基本上没有相同的词汇。
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None of it is finished yet.一点儿都还没完成。
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“Can I have some soup?” “I'm afraid there's none left.” [=there is no more soup; no soup remains]“我能喝点汤吗？”“恐怕没有了。”
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None of the birds was/were singing.没有鸟儿在鸣叫。
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Of all the competitions, none is/are more important than this one. = Of all the competitions, there is/are none as important as this one.在所有的比赛中，这个是最重要的。
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To cut back on cholesterol my doctor said I should eat less meat or none at all.为降低胆固醇，医生说我应该尽量少吃或完全不吃肉。
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“You have no doubts?” “None whatsoever.”“你一点儿也不怀疑吗？”“一点儿也不。”
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This is none of your affair/business. [=you should not interfere in this situation; it is not proper for you to say, do, or ask anything about this]这不关你的事。
have none of
: to refuse to accept, allow, or be influenced by (a particular behavior) : to not allow someone to do (something)不接受；不允许 -
I will have none of that kind of talk in my house.在我家不许谈论这类话题。
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The group petitioned to have the votes counted again, but the government would have none of that.那个组织请求重新统计选票，但政府不会同意那样做。
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They begged their mother to take them out for ice cream, but she was having none of it.他们央求妈妈带他们出去吃冰激凌，但她不答应。
none but
somewhat formal
: no person or kind of person except : only无一例外；仅仅；只有
none other than
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used to show that you are surprised or impressed by the person or thing you are about to mention竟然
second to none
: better than all others of the same kind最好的 2 none /ˈnʌn/ adverb
Learner's definition of NONE
none the
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used in phrases with adjectives like worse, better, etc., to say that someone or something is not any worse, better, etc., than before一点也不（与worse、better等形容词连用）； —
often + for -
We had to change our plans, but we were none the worse for it in the end.我们只好改变计划，但我们最后也没因此受到影响。
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She's been traveling constantly for the past several weeks, but she seems to be none the worse for wear.过去几周她一直在不停地旅行，但她看起来毫无倦意。
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The restaurant replaced the lobster with crab and the customers were none the wiser. [=customers who ate the crab did not know that it was not lobster; customers thought they were eating lobster]这家餐馆用螃蟹替代了龙虾，食客们却全然不知。
none too
: not at all一点儿也不 -
He was none too happy [=not happy at all] about the situation.对此情形他一点儿也高兴不起来。
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She was none too pleased.她一点也不满意。
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The firefighters reached the burning house none too soon. [=they reached it just in time to prevent something bad from happening]消防队员刚好及时赶到了着火的房子。