Hands free

基本解释

Another cool feature of this is the voice activation for hands free phones.
另外一個很酷的特色就是免提電話語音激活。
In a nation where most people still use public transportation to get around, commuters need to keep their hands free to hang from a subway strap or bus pole.
多數人出門還需要使用公共交通工具，這樣人們就需要騰出手來扶地鉄或者公交車的橫梁。
It is hoped the break-through will be able to create safer hands free mobile phones to help the disabled and elderly and help out professionals in high pressured working environments.
他們希望利用這項技術爲殘疾人，行動不便的老年人，以及高壓工作環境下的工作人員研制出更安全且不用雙手的手機。

They also suggested taking measures to reduce exposure to the signals, like hands-free devices or texting.
So, I encourage you to do that the next time you have some free time on your hands, maybe at IAP or some time like that.
下次你有空餘時間時,我鼓勵你去看一看，也許在IAP或者什麽時候。
麻省理工公開課 - 化學原理課程節選
" ...when all of God's children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual: Free at last! Free at last!

Equipped with a built in microphone, hands free phone conversations and multiple listener conference calls have never been easier.
ENGADGET: Edifier's iF335 Bluetooth speaker pumps up the volume for $99