Forbided customary law come from the feelings of dread; Allowed customary law come from the instinct ofimitation.
禁止性的习惯法，源于人的恐惧心理；允许性的习惯法，源于人的模仿本能。
2
Giving an imitationof traditional plastic theory , a damage surface model on brittle rock about temperature in stress-space is introduced and the evolutionary law is discussed qualitatively.