Using the comparion theorem of difference equation, persistence theorem of discrete semi-dynamical system and stability of monotonous operator, we gain the boundary, uniform persistence and permanence of the system.
应用差分方程的比较原理 ,离散半动力系统的持久性定理以及单调算子的三分稳定性 ,获得系统的有界性 ,一致持久性 ,永久持久性 。
Using the theorem on discrete semi-dynamicl system and the stability results on monotonous and continuous operator,we obtained the sufficent conditions for uniform boundness,strong and weak persistence and permanence of a discrete system with age-structure subdivided into young and adult population approximately.
应用差分方程的比较原理、离散半动力系统的持久性定理和单调连续算子的三分稳定性获得了一类捕食者具有年龄结构 ,即将捕食者近似地分为幼年和成年种群的离散捕食系统一致有界、弱持久、强持久和永久持久的一组充分条件 。
Permanence and Existence of Periodic Solutions of a Predator-Prey Patchy Model with Dispersal and Time Delay;
对一类在斑块环境下具有Beddington型功能性反应和时滞现象的非自治捕食系统进行了研究,证明系统在适当的条件下是永久持续生存的;利用重合度理论,得到了一组保证该系统存在正周期解的充分条件。
store in a deepfreeze, as for conservation.
低温保存以便永久保持。
Perenially fresh or interesting; enduring.
永保青春的，不衰的永保新鲜和兴趣的；持久的
There's no permanency about those little distinctions.
那些小小的头衔并不能保持永久。
not permanent; not lasting.
非永久的，不持久的。
a durable peace, friendship, settlement
持久的和平、 永恒的友谊、 永久的解决
purchase in perpetuity
购买永久持有权年数
It would never endure.'
这种文明永远不能持久。”
permanent failure
永久性故障（持续性故障）
Gold and silver jewellery is permanently inflation-proofed in value.
金银珠宝，永久保值。
existing permanent unprotected file
现有永久性非保护文件
This product comes with lifetime warranty.
这件产品有永久保证。
Books do not last forever.
图书不能永久保存。
A permanent virtual circuit is a path that stays open even when no traffic is using it.
永久性虚拟电路是即便没有信息流通过时仍保持开放的通道。
Because the evergreen trees stay green all year, they're a symbol of never-ending life.
因为常青树可以全年保持青绿，他象征着生命永久长青。
To persist in or remain constant to a purpose, an idea, or a task in the face of obstacles or discouragement.
坚持不懈，锲而不舍在面临阻碍或挫折时，坚持或永久保存一个目标、想法或任务
Having lasting significance or worth; enduring.
历久不衰的，持续的有永久的意义或价值的；持久的
To have a persistent, restless craving.
渴望有持久的、永不停止的渴望
Q: Yet, the problem of permanency, of continuity of being, is not solved.
但、永久持续地存在这个问题仍未解决。