'Well, if she doesn't pay the toll, your mistress's niece can't pass through the gate,' replied the gatekeeper.

“好吧，如果你的女主人的侄女不付过路钱，她就不能从路卡通过，”守卡人回答。

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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》

In order to pass through a "gate" between two states, the architecture under development has to be validated for compliance and communicated outside of the architecture team.

为了通过两个状态之间的“大门”，开发中的架构必须得到一致性方面的验证，并在架构团队的外部进行交流。

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After then checking in as normal at the same kiosk, passengers can pass through a miSense automatic security gate by placing their finger on a scanner and inserting their boarding card into the reader.

CNN: Heathrow tests biometrics

There was much more at stake for them than there had been for the Groton grads of an earlier day. (How many hours do you think they put in doing homework?) College was a gate through which, once, only the favored could pass.

NEWYORKER: Live and Learn