一个完整的系统后门妥协改变，允许它的系统使用了攻击对于恶意用途不明的用户。
A Backdoor compromises system integrity by making changes to the system that allow it to by used by the attacker for malicious purposes unknown to the user.
请投标人在汇款时务必注明所投标项目的招标编号，否则，因款项用途不明导致投标无效等后果由投标人自行承担。
The bidders should indicate the biding numbers of the bid project, otherwise, the money purposes unknown would cause bidding invalid and it shall be assumed by the tender.
敝公司了解贵公司所需集成电路之型态，但不明了所需之规格，如电压，电流等等资料，是否能告知此集成电路的用途。
We realize the types of IC you need, but we do not know the specification you require for that IC such as the voltage current. Could you please tell us the purpose of this IC?
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