permanent和perpetual有何区别?

1.permanent-指永久不变的，如"永久的"住宅、地址或职业等。

例:
permanent tooth
成人齿(恒牙)
permanent thermocline
【海】恒定温跃层
permanent residence
永久住处
permanent domicile
固定户籍
permanent assets
【会计】固定资产

2.perpetual-指保持永久不变，没有中断的行为，永无止境地持续下去或老是不断出现的事物或现象。

例:
perpetual lessee
永久承租
a perpetual rose
四季开花的蔷薇
a perpetual lease
永久租地权
a perpetual friendship
永久的友谊
a perpetual calender
万年历
In Ireland there is so little sense of compromise that a girl has to choose between perpetual adoration and perpetual pregnancy.
在爱尔兰这个地方，由于几乎无妥协可言，年青姑娘不得不从永久偶像与不断怀孕之间选择其一。
a perpetual struggle;
长期的斗争；

Perpetual和Permanent的区别辨析:
Perpetual,永久的.指示未来的(future)和确立的(established)事物,例如说祁求和平,响往未来.
Permanent,永久的.有不变的(remaining without change)意味,例如誓言,许诺.
另外Eternal Endless Forevor等等用法都需要辨析.

permanent
adjective
1 lasting for a long time or forever:
She is looking for a permanent place to stay.
Are you looking for a temporary or a permanent job?
The disease can cause permanent damage to the brain.
A semi-permanent hair dye will wash out after about three months.
He entered the United States in 1988 as a permanent resident because of his marriage to a U.S. citizen.

2 describes something that exists or happens all the time:
Mont Blanc has a permanent snow cap.
Our office is in a permanent state of chaos.

permanent
noun [C]
US FOR perm

permanently
adverb
always and forever:
Smoking is likely to damage your health permanently.
Michael and his family have settled permanently in the States.
I seem to be permanently broke.

permanence
noun [U] (FORMAL permanency)
staying the same or continuing for a long time:
A loving family environment gives children that sense of stability and permanence which they need.
NOTE: The opposite is impermanence.

perpetual
adjective
1 continuing forever in the same way:
They lived in perpetual fear of being discovered and arrested.
He has hard, cold eyes and his mouth is set in a perpetual sneer.
a perpetual student

2 frequently repeated:
perpetual vandalism

perpetually
adverb
She's perpetually asking me for money.

perpetuate
verb [T] FORMAL
to cause something to continue:
Increasing the supply of weapons will only perpetuate the violence and anarchy.
The aim of the association is to perpetuate the skills of traditional furniture design.

perpetuation
noun [U] FORMAL
The lack of military action from other countries has contributed to the perpetuation of the civil war.

perpetuity
noun FORMAL
in perpetuity for ever

I think it's better to use an English only dictionary to compare the meaning of English words...

The best is http://www.dictionary.com although it might be a bit difficult.

This one is good too, a little easier to understand:
http://dictionary.cambridge.org