a real number that cannot be expressed as a rational number 不能用有理数表示的实数
not consistent with or using reason 与理性不一致或不使用理性的 real but not
expressible as the quotient of two integers 实数但不能表示为两个整数的商
a source of danger; a possibility of incurring loss or misfortune
危险的根源,招致损失或不幸的可能性 an unknown and unpredictable phenomenon that causes an
event to result one way rather than another 一种未知的、不可预测的现象,使事件以一种方式而不是另一种方式发生