*更新：
剛剛在書上有看到大概有三個原因可是看不太懂，望各位大大開示：
1、The answer is complicated, with one reason being the development of the com
munity of surrounding nations that needed a weak, internally fragment center i
n which they could adjust the shifting balance of their own interests and figh
t their wars.
(這裡實在看不懂，他們需要一個很弱的中心讓他們能夠……？)
2、Another reason was the emperor’s very weakness, which tended to make him a
n effective peacemaker and a sovereign who ruled through fixed law instead of
a despot.
(為何皇帝很弱，所以變成一個和平主義者？)
3、A further reason for the surprising longevity of the Holy Roman Empire was
the principle of the elective kingship. The higher rank of the aristocracy par
ticipated in the institutions and were disposed to support and cooperate with
the sovereign they chose. Every vote they cast in a royal election was a renew
ed vote for the continuation of the empire, and thus it was precisely the prin
ce elector who came to serve as guarantors of its cohesion and permanence.
(這邊好像比較能夠理解，大概是自己選的皇帝，自己挺？)
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小妹不才，最近正在念德意志地區的歷史，不過有點疑問，希望各位大大解惑。
日耳曼在政治上十分分裂，照理說紛爭那麼多，內憂外患的，神聖羅馬帝國到後來也是德
意志自己在玩的，那為什麼他可以存在到19世紀才消失呢？
才疏學淺，有哪裡不正確的地方，懇請各位指教。