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。
2
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。
3
For example, the default invariant condition for a field requires the field to be non-null.