首次选取泰勒级数的部分二次项，用一个距原点最近点处拟合的超低维曲面近似极限状态面。

Firstly part of quadratic term of Taylor series is chosen; a low-dimension surface is used to approximate limit state surface; and the modified reliability formula is derived.

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那么这是一个用简单近似得到速率的过程，简单的极限情况。

So this is a process of getting the rates by using a simple approximation here. Simple limiting case.

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我们仍然可以用高温极限近似。

You can be in the high temperature limit. And easily are.

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