The essential condition for the decay of the vacuum is the presence of an intense electric field.

真空衰变的基本条件是存在强电场。

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In cases where the data used to populate a target field is dependent on some condition, that condition can be applied to the mapping on that target field.

对于要依赖某种条件来使用数据填充目标字段的情况，可以对该目标字段上的映射应用条件。

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For example, the default invariant condition for a field requires the field to be non-null.

例如，字段的默认不变条件要求字段不能为空。

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