1·If an unknown person enters a home, the camera will send the owner a warning that will cause an alarm to sound on the owner's smartphone.
如果一个不知名的人进入家中，摄像头就会向主人发送警告，并在主人的智能手机上响起警报。
2·When most of us get a text message on our cell phone from an unknown person, we usually say "sorry, wrong number!"
当我们收到陌生人的短信时, 我们通常会说：“对不起, 你发错了！”
3·The unknown person now had a name, a family and a tragic story.
那个不曾相识的人有姓名和家庭，还有一个悲惨的故事。
4·Your best response to a request from an unknown person is simply to decline politely.
你最好的回应一个不知名的人的请求只是礼貌地下降。
5·Life is full of unknowns, and you can solve the unknown person, either or the unknown!
人生充满未知数，而你就要么解决这个未知数的人，要么成为这个未知数！
6·Most owners of infected computers neither know nor care that their machines may be damaging an unknown person in an unknown way.
大多数受感染的电脑的使用者既不了解也不关心他们的电脑可能正以某种未知的方式损害到某个未知者。
7·I just want a life of their parents to their children, I can not get the parents hard-earned money to help an unknown person.
我也只是一个依靠父母生活的孩子，我无法拿父母的血汗钱去帮助一个来路不明的人。
8·Herr Paulick, a prominent Socialist, was attacked in a dark street at Dessau by an unknown person and received severe face injuries.
社会党有名的人物宝里克在德绍一条黑暗的街上被一个匿名人士攻击，脸部受重伤。
9·Milgram conducted experiments by sending letters to random acquaintances, asking them to pass the letter on through their friends to an unknown person.
米尔·格兰姆做了个实验，他寄信给随机选出来的熟人，请他们通过他们的朋友再将信传给一个不认识的人。
10·As I looked harder and longer, as my eyes got used to the solid black wall, I wondered if an unknown person for an unknown reason had draped a black blanket over our door.
我仔细地看了很久，眼前只有一睹黑魆魆的大墙，我甚至怀疑是不是一个不认识的人因为不知名的原因把一块黑毯子挂在了我的门上。