Without a gate at (or near) an entry point, code would run with whichever keys the caller happened to hold.

如果在入口点处(或者附近)没有这样的门，那么代码将使用调用者当时持有的任何键来运行。

youdao

The guard won't let anyone through the gate without a pass.

哨兵不让没有通行证的人通过大门。

《新英汉大辞典》

Because of that, they wanted to keep a close eye on us, and for a couple of weeks they wouldn't let us out of the school grounds without an escort (there was a fence and a gate around the campus).

由于这一点，学校总是把我们盯得紧紧的，甚至有那么两星期时间，没有(校方人员)陪同，还不允许我们离开校园(校园有围墙和大门)(美国的学校没有围墙，所以作者需要特别强调这一点——译者注)。

youdao

This is the annual bang-your-head-against-the-goalpost debate that occurs whenever a high-quality team sprints out of the gate without a loss.

WSJ: Jason Gay: Could Green Bay Win by Losing?

In September, Argenbright employees left a metal detector unattended, allowing at least one passenger to walk to a US Airways gate without screening.

CNN: License suspended for Boston Logan security firm

Tonight I ask Congress and the American people to focus the spirit of service and the resources of government on the needs of some of our most vulnerable citizens: boys and girls trying to grow up without guidance and attention, and children who have to go through a prison gate to be hugged by their mom or dad.

CNN: Transcript of State of the Union