a grain of truth

• 一条真理

a grain of truth的用法和样例：

例句

1. One falsehood spoils a thousand truths.
   一个谎言毁坏千条真理。
2. The truth is equally suitable for the user to type color multifunction business card printing and membership card.
   这条真理同样适合于用户转型彩色数码制卡和会员卡制作。