Short of not using a cellphone, the lowest exposure would come from using the speaker phone or a wired headset or ear buds.
2
人们使用无线耳机和耳麦的原因与使用有线的相同：希望获得私人的声音体验，并解放双手。
People use wireless headsets and headphones for the same reasons they use wired headsets and headphones: they want to hear sounds privately and they want to free their hands.
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