千里之堤,溃于蚁穴
qiān lǐ zhī dī , kuì yú yǐ xué
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1 an ant hole may cause the collapse of a great dike (idiom)
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2 huge damage may result from a moment's negligence
说时迟,那时快
shuō shí chí , nà shí kuài
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1 (idiom) no sooner said than done
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2 before you know it
这山望着那山高
zhè shān wàng zhe nà shān gāo
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1 lit. the next mountain looks taller (idiom); fig. not satisfied with one's current position
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2 the grass is always greener on the other side of the fence