In the update trigger, you need to delete the corresponding feature if one of the coordinates becomes null.

在更新触发器中，如果坐标值之一变成null，那么需要删除对应的特性。

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The update trigger is more complicated: if the update causes an exception, you have to delete the existing feature row, just as for null coordinates.

更新触发器比较复杂：如果更新导致异常，那么必须删除现有的特性行，就像处理null坐标一样。

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An alternative way of creating a heap dump is to use another useful Rubinius feature: the Query Agent, which allows monitoring tools to access Rubinius information as well as trigger certain actions.

创建堆转储的另外一种方式是使用Rubinius的另一个特性：Query Agent，监测工具可以凭借它访问Rubinius信息并触发某些动作。

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Look, we're all for filling our iPhones with gigabytes upon gigabytes of stuff that would make us especially anxious to trigger the Remote Wipe feature if we were to misplace it, but we've got to admit -- the dude went about it the wrong way here, Apple caught him, the world keeps turning.

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One very nice feature is support for torrents that you can trigger remotely for download to the player (presumably on an attached disk drive here, as there's no internal storage from what we can tell).

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The most powerful feature, though, is the ability to create programs that can automate tasks, send alerts and trigger events based on data from the sensors.

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