不安【bù ān】
1. unstable; not peaceful; disturbed 2. worried; uneasy; restless 3. sorry
[形] 1、不安定，不安宁 2、感到烦恼、不宁 3、客套话，表示歉意和感激
 世界上有些地区的局势仍动荡不安。 The situations in some areas of the world are still unstable.
 受到打击后，他不安的心情一时难以平静下来。 He could not settle himself down after being hurt mentally.
收下他这么贵重的礼物，我心里实在有些不安。 I feel uneasy after accepting such an expensive gift.
不卑不亢【bù bēi bù kàng】
neither overbearing nor servile; neither humble nor arrogant
[成] 对人有恰当的分寸，既不低声下气，也不傲慢自大
他不卑不亢的态度得到了大家的尊重。 His stance of neither being humble nor being arrogant won the others' respect.
不比【bù bǐ】
unlike; cannot compare with
[动] 不可相比；比不上；不同于
 通常电视购物并不比在商店购物便宜多少。 The goods bought via television are not much cheaper than those from the stores.
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不必【bú bì】
need not; not have to
[副] 没有必要
 不必替我们担心，我们自己会处理好这件事的。 You needn't worry about us. We will take care of that.
不耻下问【bù chǐ xià wèn】
not feel ashamed to ask for advice from one's subordinates
[成] 乐于向学问或地位比自己低的人学习，而不觉得不好意思
 愚者不学无术，智者不耻下问。 Fools learn nothing from wise men, but wise men learn much from fools.
不辞而别【bù cí ér bié】
leave without saying goodbye
[成] 没有告辞就离开了
 他这种不辞而别的行为是极其不负责的。 It is exceedingly irresponsible of him to leave without saying goodbye.
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不错【bú cuò】
1. correct; right 2. not bad; ok
[形] 1、对，正确 2、令人满意的，过得去的
 你说得一点儿不错，她不会来了。 You are right, she will not come.
 他的书法不错，但是和你的相比还是差了些。 His calligraphy is fairly good but not as good as yours.
不大【bú dà】
not very; not often
[副] 程度不深，不经常
我不大喜欢看电影，你还是别买票了。 I don't like to see movies very much, so you'd better not buy the ticket for me.
不但【bú dàn】
not only
[连] 不仅，不只是，常表示递进
 她不但长得漂亮，而且脑子也很聪明。 She's not only beautiful but also intelligent.
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