这些事件类型被定义为投递型常数，如下所示。

These event types are defined as post-type constants as follows.

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常数可以是整数、字符、浮点数、字符串、Boolean、octet或枚举型，但不能是any类型或用户定义的类型。

Your constants can be integer, character, floating-point, string, Boolean, octet or enumerated but not of type any or a user-defined type. Here are some examples.

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获得了一类带有连续和分段常数变元的中立型微分方程所有解振动的新的充分条件。

The new sufficient conditions for the oscillation of all solutions of the neutral differential equation with continuous and piecewise constant arguments are obtained.

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