from后面能跟人名吗 这种情况下from具体是什么意思

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• from后面能跟人名吗 这种情况下from具体是什么意思
• 请英语大神翻译一下这句话,谢谢~~it is reasonable to suppose that while certain individuals perceive high risk in online shopping and will only be prepared to trust a certain web site if they perceive many signals from a firm and if they have had a satisfactory previous experience, other individuals who perceive less risk will require fewer signals from the firm or web site to trust, and previous satisfaction will play an important role.除了翻译之外能再具体说一下那个signal是什么意思吗?谢谢
• be exempt from 还是 be exempted from 书上是前者,为什么不用被动?
• On the desk (lies an old envelope),which contains some photos 桌子上有一只旧信封,里面装着些照片