不三不四【bù sān bù sì】
dubious; shady
[成] 不正派
 这些不三不四的人整天干见不得人的事。
Those dubious guys are always doing bad deeds.
不少【bù shǎo】
more than; a lot
[形] 比较多
 合理理财能帮你省不少钱。
Good financial planning will help you save a lot of money.
不时【bù shí】
often; frequently
[副] 经常不断地
 他的演说不时被雷鸣般的掌声打断。
His speech was frequently interrupted by thunderous applause.
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不是【bú shi】
mistake; fault
[名] 错误,过失
 这是我的不是,别怪他。
It is my fault, you should not blame on him.
不是…而是…【bú shì…ér shì…】
not. . . but. . .
[关联]表示对比关系,否定在前,肯定在后
 他们这并不是批评而是诽谤。
This is not criticism but slander from them.
不是…就是…【bú shì…jiù shì…】
either. . . or. . .
[关联]表示选择关系,两项中至少有一项是事实
 我一定会来拜访你的,不是明天就是后天。
I am going to call on you either tomorrow or the day after tomorrow.
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不是吗【bú shì ma】
used in a rhetorical question to emphasize one's own opinion or conform one's idea; isn't it
[动短]表示反问,用来强调对某种看法或事实的肯定
 长大后你还是父母的孩子,不是吗?
You will still be your parents' kids when you grow up, won't you?
不停【bù tíng】
continuously
[副] 不间断地
 雨下个不停,看来我们是走不了了。
It is continuously raining. It seems that we cannot go.
不同【bù tóng】
different; distinct; not alike
[形短] 不一样
 这家电台以三种不同的频率广播。
This radio station broadcasts at three different frequencies.
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