From an experimental point of view, it is certainly never observed.

从实验的角度来看，这种情况从未被观测到。

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There is, however, a further and even more serious objection from an experimental point of view.

但是，从实验的观点来看，还有一个更为严重的缺点。

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There is, however, a further and even more serious objection from an experimental point of view.

但是，从实验的观点来看，还有一个更为严重的缺点。

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