If you want to know all event groups, use "-g -1."
如果希望了解所有事件组，那么使用“-g -1”选项。
Then you know that the gradient of g is perpendicular to the level surface.
那么就知道了g的梯度,是垂直等值面的。
If that is the case then you know this is a level set of g.
这种情况下，这只是g的一个水平集。
E. g. : : If you don't know how to spell a word, consult a dictionary.
例句：如果你不知道怎么拼写单词，你可以去查字典。
可你们知道3g是怎么来的吗？
You may have heard of Kenny G, but what do you really know about jazz?
你也许听说过凯丽·金，但是对爵士乐你真的了解多少呢？
You may have heard of Kenny G, but what do you really know about jazz?
你也许听说过凯丽·金，但是对爵士乐你真的了解多少呢？
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