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启动后和关闭前挂钩在默认情况下是空的。
The post-startup and pre-shutdown hooks are blank by default.
youdao
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启动事件有启动后挂钩；停止事件有关闭前挂钩。
The start events have post-startup hooks; the stop events have pre-shutdown hooks.
youdao
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把车开走前，请再检查一下拖车的挂钩。
Before driving away, re-check the trailer coupling.
《柯林斯英汉双解大词典》