它可以是一段歌唱、一阵喊叫、或是绵绵细语，它也可以是激活设备的一道口令，或是我们在银行的身份证明。

We can use them to sing, shout and whisper sweet nothings. We can use them to activate gadgets and prove who we are to banks.

youdao

它可以是一段歌唱、一阵喊叫、或是绵绵细语，它也可以是激活设备的一道口令，或是我们在银行的身份证明。

We can use them to sing, shout and whisper sweet nothings. We can use them to activate gadgets and prove who we are to banks.

youdao