1.(lit.) the ugly daughter-in-law must sooner or later meet her parents-in-law (proverb)2.(fig.) something unpleasant or embarrassing cannot be avoided forever; sooner or later one must face it
1.If you work at it hard enough, you can grind an iron bar into a needle.2.cf idiom 磨杵成针, to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult task3.to study diligently