说明这两种例外处理类型，并建议每种类型最适当的使用时机。

Describes both types of exception handling and suggests when they are most appropriate.

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虽然这一招被世界杯选手们广泛使用，但它的使用时机还是很微妙和不容易掌握的。

While this movement is often used by World Cup skiers, its timing can be somewhat tricky.

youdao

建议模式的使用时机，是在尚未定义类别和成员前就要使用这些类别和成员的时候。

Use suggestion mode when classes and members are used before they are defined.

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