It is difficult for a lay person to gain access to medical libraries.

非专业人员很难进入医学图书馆。

For logistical and political reasons, scientists have only recently been able to gain access to the area.

因后勤与政治原因，科学家们直到最近才得以进入该地区。

Thus I have been allowed to gain access to their living environment.

因此我被允许进入他们的生活环境。

Intruders might invade your systems for one of two reasons: to gain access to information that they should not have or to alter the behavior of a system.

入侵者入侵您的系统可能是出于这两个原因之一：为了获取他们本不应该拥有的信息，或者为了改变系统的行为。

By posting your resume online, you can make yourself instantly accessible to thousands of schools nationwide, and you'll also gain access to our large database of open teaching jobs.

通过在网上发布简历，你可以让全国成千上万的学校立即看到你的简历，同时你也可以访问我们开放的大型教职数据库。