国际互联网公司一向难以取代本土网络品牌，而阿里巴巴所瞄准的特定市场的规模目前尚不清楚。
International Internet companies have poor track records of unseating homegrown Internet brands and the size of the niche Alibaba is targeting remains unclear.
我们知道在现实世界里人们通过书的封皮来评价书的好坏。但在这个研究之前，我们不清楚人们是怎么样在网络上评判他人的。
It's already known that people judge a book by its cover in the real world, but before this study, it was less clear how users judged other people online.
他参与的确切性质还不清楚，但是在以往的调查中，警方有时会逮捕这些没有在网络上隐藏踪迹的小人物。
The precise nature of his involvement was unclear, but in past investigations, the authorities have sometimes arrested those unsophisticated enough not to cover their tracks on the Web.
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