This often happens via attachments sent in email or shared USB drives.

通常会在附件或U盘中出现。

For students without home internet, the buses bring USB drives loaded with schoolwork and video lessons from teachers.

对于那些家里没有互联网的学生，校车会带来装载有作业和教师视频课程的U盘。

I will leave USB drives in company bathrooms, in lobby bathrooms and more importantly when I'm on an engagement, I have a stack of blank envelopes.

我会把 USB 驱动器留在公司浴室、大厅浴室，更重要的是，当我执行任务时，我有一叠空白信封。

We'll start with viruses. These bugs hitch a ride when something, like a file, is shared between computers. This often happens via attachments sent in email or shared USB drives.

我们先从病毒说起。 像文件夹这样的分享文档便是电脑病毒的载体，它们通常隐藏在电子邮件的附件或U盘里。