库纳尔和霍洛维茨报告说，那些使用免提电话之类的人，他们的平均反应时间比不使用免提电话的人慢212毫秒。

As Kunar and Horowitz report, those who were making the equivalent of a hands-free call had an average reaction time 212 milliseconds slower than those who were not.

youdao

如果发现你在车上把手机放在耳朵旁，华盛顿警方将截停你在路边，但如果你使用免提电话，他们就不会。

D.C. police will pull you over if they see you using a cellphone that you’re holding up to your ear, but not if you’re hands-free.

youdao

若非必要，不要使用电话的免提功能。

Don't use a speaker phone unless absolutely necessary.

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