1)perennial yield,持久不断的量2)permanent,永久的，不变的，持久的3)It is unchangeable and permanent.,这是持久不变的。4)non-persistent,不持久的;不稳定的5)persistence vector,持久矢量6)perpetual,永久的，永恒的，不间断的
用法例句
The average chain conformations of polyoxyethylene chain in the third\|order interaction approximation and the effect of third\|order interaction on persistence vectors are investigated.
