Father is annoyed that his daughter consorts with all kinds of strange people "女儿与各种来历不明的人厮混在一起,父亲很是恼火。
We ' ve seen schools of opelu here that numbered in the thousands 有时它们聚在一起竟然遮住了阳光，看起来像来历不明的黑斑点组成的黑色波状物。
Avoid buying any brands from unknown sources that could be fake and contaminated with mercury 避免购买一些来历不明可能假冒或受汞污染的货品。
Initial investigation revealed that the chickens were of unknown origin and were abandoned there 初步调查显示，这些鸡只来历不明，是被人遗弃在该处。
Now i was letting a perfect stranger into my house . what would i do if he were up to something bad ? 随便让一个来历不明的人进来，万一他心怀不轨，我该怎么办？
Be wary of opening unexpected emails with attachments , and never click on a hyperlink in a suspicious email 不要随便开启来历不明并载有附件的电邮，并且切勿按动可疑电邮内的超连结。
Update your anti - virus software regularly to detect new viruses and do not download software from sources you do not trust 你必须定期更新防毒软件，才能侦测最新的病毒，也应避免下载来历不明的软件。
Receive the assistance that the unexplained or suspicious e - mail please call it department as soon as possible or delete it directly 收到来历不明或可疑的电子邮件请尽快要求it部门的协助或者直接删除。
With frequent updates . scan floppy disks , compact disks and other storage media , especially those of unknown sources , before use 在使用前，先扫描检查软磁碟、光碟和其他储存媒体，尤其是来历不明者。
Second , you should not open e - mail from unknown sources rashly , so that no virus can have access to your computer through e - mails 其次，对来历不明的电子邮件，不要贸然打开以防止通过电子邮件传染病毒。
