求翻译：到目前为止，关于非局部条件的发展方程解(适度解、强解、古典解)的存在性、唯一性、稳定性，已经有了不少深刻结果$^{[62-69]}$，但很少涉及弱解的存在性。是什么意思？

So far, the development of non-local conditions Equations (mild solution, strong solution of the classical solution) the existence, uniqueness, stability, already has a number of profound results $ ^ {[62-69]} $ but rarely involves the existence of weak solution.

So far, with respect to non-local conditions of the development equation solvers (moderate, strong, and classical) and the existence of a unique, stable, and there are already many profound results in $ ^ { [ 62- 69] } $, but rarely with the existence of weak.

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To date, regarding the development equation with non-local conditions (moderate, strong solution, classical solutions) the existence, uniqueness, stability, there are already a lot of impressive results $^{[62-69]}$, but few involve the existence of weak solutions.

So far, about non-partial condition development equation solution (moderate solution, strong solution, classical solution) the existence, uniqueness, the stability, already had many profound result $^ {(62-69)} $, but very little involves the weak solution the existence.