元久（1204年二月二十日至1206年二月二十日）是日本的年号之一。后鸟羽上皇实施院政。这个时代的天皇是土御门天皇。镰仓幕府之征夷大将军为源实朝；执权为北条义时。
神经元受损越少，就越有可能尽可能久的保护你拥有的记忆。
The less damage [to] the neurons, the more likely we will be able to preserve what you have for as long as possible.
根据简并态微扰理论和氢原子波函数的性质，得到久期方程中微扰矩阵元的分布规律。
According to the perturbation theory, a distribution law of matrix element in secular equation is discovered in degenerate state and wave function property of the hydrogen atom.
对于他的族属久有争议，《元诗选》所收诗作亦颇有阙佚。
There has been debate on his ethnic background in academic circles in China.
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