扎扎实实，踏踏实实，言犹在耳，发人深省。
与此同时，另一款重要数码产品，手机也开始了更新换代。
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char bucket = h->bucket;
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.