Frequency hopping is the key technology used to suppress interference in Bluetooth system.

跳频是蓝牙使用的抑制干扰的关键技术。

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Then this text is to analyze and recommend the key technology of Bluetooth system ( choosing frequency band , address code , rate;

然后，分析介绍了蓝牙无线系统的关键技术（选择频段、地址码、速率；

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Bluetooth icon is ever green if a user doesn't press any key.

蓝牙图标是绿色以往，如果用户不按任何键。

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