他用签的是假名。
假名一个作者采用的假名；
He checked in at the hotel under a false name.
他用假名字登记住进了旅馆。
He checked in at this hotel under a false name last night but this morning he checked out.
他昨晚在这个旅馆用假名登记住宿但今早他又结帐离开了。
He had been living in England under a false name, for several months when the long arm of the law finally caught up with him.
他隐姓埋名在英国住了数月，可最终还是逃不脱法律的制裁。
Creating groups like this may not violate Facebook's Terms of Service, although at the very least, creating a Facebook profile under a false name does.
创建这样的组群或许没有违反Facebook的服务条款，但以不实之名创建个人资料则至少有悖facebook服务条款。
The phenomenon of pseudepigraphy, that is,writings under a false name, was very,very popular in the ancient world, and we have all kinds of evidences for it.
伪典现象，即假借他人之名创作的作品，在古代是非常流行的，我们有大量的证据。
Thaksin reportedly lived under a false name in Germany for more than a year and has used illegally received passports from a number of other countries as well.
据报道，他信隐姓埋名在德国生活了一年多，并曾使用过从其他一些国家非法获得的护照。
Tyndale was helped, by Londoners with more worldly wisdom than himself, to go to Germany under a false name, with his half-completed rendering of the New Testament tucked deep inside his trunk.
在比他圆通世故的伦敦人帮助下，廷代尔把译完一半的新约藏进箱子底层，化名逃到德国。
Tyndale was helped, by Londoners with more worldly wisdom than himself, to go to Germany under a false name, with his half-completed rendering of the New Testament tucked deep inside his trunk.
在比他圆通世故的伦敦人帮助下，廷代尔把译完一半的新约藏进箱子底层，化名逃到德国。
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