For this reason, the passive voice is very common in more formal writing, where the authors want to keep the perpetrator of the action or the speaker distant.

因此，被动语态在正式写作中比较常见，作者想要让进行动作的一方或说话人能产生一种距离感。

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The M1031-W also includes an integrated passive infrared sensor for motion detection, a white LED light, and two-way audio support with a built-in microphone and speaker.

M1031-W还包括一个适合移动侦测的集成被动红外传感器，白色LED灯，和支持内置麦克风和扬声器的双向音频。

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With the speaker on audio, say both the active and passive sentences with the same rhythm pattern.

跟着录音，说出带有相同节奏的主动和被动的句子。

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Each speaker in this system has a tweeter, woofer and four-inch passive bass radiator on the back that moves a surprising amount of air.

WSJ: Big Sound, Wire-Free: Audyssey Bluetooth Speakers | Geek Chic

The BRAVEN SIX Series speakers have two custom extended-range drivers and 3 watt speaker output providing high-fidelity stereo audio with left- and right-channel passive sub woofers.

ENGADGET: Braven Six Series speakers offer Bluetooth audio, wired charging