【main，man】
“to flow，to stay” “流动；保持”
|permanence=per+man+ence n.持久，永久
per-“始终”
-ence “状态”
eg：Human speech lacks the stability and permanence of the printed word.
|maintain=main+tain v.维持；维修
tain “拿”
eg: Funds maintains the survival and development of a company.
|remain=re+main v.保持；剩余 n.遗迹；剩余物
eg：The government remained in control.
【词汇扩展】
immanent a.内在的，固有的
remainder a.剩余的
manor n.庄园
remnant n.剩余
emanate v.发出，散发
（以上均来自《200个一定要学的英文词根词缀》一书）
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