1·The origins of some words are unknown.
这些词的起源是不知的。
2·The owners of these firms are unknown.
而这两家公司的所有者根本就不为人知。
3·Casualties on the northern side are unknown.
而朝方的伤亡人数未知。
4·A real person to death are unknown and lonely.
一个真实的人至死都是无名和孤寂的。
5·Scientists say the plan's chances of success are unknown.
科学家表示，该计划的成功几率仍然是个未知数。
6·I recognize a lot of brand names, but there are unknown labels too.
我认得很多牌子，但也有不认识的标签。
7·Apart from her black belt in karate, her hobbies and tastes are unknown.
除了她在空手道中的黑色的腰带以外，她的爱好和口味是未知的。
8·The footprints of tourists and the corrosiveness of sand storms are unknown.
游客的足迹和沙尘暴的腐蚀性是不能觉察的。
9·He never was found and so the whereabouts of this man are unknown | even today.
他从来没有被发现，所以这个人的下落未知|即使在今天。
10·Their brands, though well established at home, are unknown in Europe or America.
他们的品牌虽然在国内享有很高的知名度，但在在欧美却默默无闻。