刀不磨要生锈，人不学要落后
dāo bù mó yào shēng xiù , rén bù xué yào luò hòu
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1 a blade will get rusty if it is not sharpened; a man will fall behind if he doesn't study (idiom)
切磋琢磨
qiē cuō zhuó mó
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1 lit. cutting and polishing (idiom)
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2 fig. to learn by exchanging ideas or experiences
卸磨杀驴
xiè mò shā lu:2
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1 lit. to kill the donkey when the grinding is done (idiom)
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2 to get rid of sb once he has ceased to be useful
只要功夫深，铁杵磨成针
zhǐ yào gōng fu shēn , tiě chǔ mó chéng zhēn
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1 If you work at it hard enough, you can grind an iron bar into a needle.
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2 cf idiom 磨杵成針|磨杵成针, to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task
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3 to study diligently
好事多磨
hǎo shì duō mó
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1 the road to happiness is strewn with setbacks (idiom)
有钱能使鬼推磨
yǒu qián néng shǐ guǐ tuī mò
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1 lit. money will make the Devil turn millstones (idiom)
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2 fig. with money, you can do anything you like
极深研几
jí shēn yán jǐ
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1 deep and detailed investigation (idiom)
磨刀不误砍柴工
mó dāo bù wù kǎn chái gōng
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1 lit. sharpening the axe won't make the wood-splitting take longer (idiom)
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2 fig. time invested in preparations is not lost
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3 a beard well lathered is half shaved
磨刀霍霍
mó dāo huò huò
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1 lit. to sharpen one's sword (idiom)
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2 fig. to prepare to attack
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3 to be getting ready for battle
磨嘴皮子
mó zuǐ pí zi
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1 to wear out the skin of one's teeth (idiom); pointlessly blather
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2 to talk incessant nonsense
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3 blah blah
磨杵成针
mó chǔ chéng zhēn
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1 to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task
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2 to study diligently
磨破嘴皮子
mó pò zuǐ pí zi
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1 to wear out one's lips (idiom)
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2 to talk until one is blue in the face
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3 to repeat again and again
磨穿铁砚
mó chuān tiě yàn
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1 to grind one's way through an ink stone
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2 to persevere in a difficult task (idiom)
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3 to study diligently (idiom)
耳鬓厮磨
ěr bìn sī mó
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1 lit. heads rubbing together (idiom)
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2 fig. very close relationship
软磨硬泡
ruǎn mó yìng pào
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1 to coax and pester (idiom)
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2 to wheedle
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3 to cajole