To discover Churchill's secret London, therefore, requires a guide, and there is arguably none better than Sir Martin.

要揭示邱吉尔在伦敦的秘密，需要一位向导，而马丁先生（爵士）是再适合不过的人选。

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To limit their impact on the fragile ecosystem, Galapagos National Park -- which makes up 97% of the archipelago -- requires tourists to be accompanied by a certified guide when they enter protected areas.

CNN: Close encounters in the Galapagos

There are two main approaches to repairing a hernia: an open repair that requires a large incision, or a minimally invasive laparoscopic technique, which uses a camera to guide instruments through a tiny incision.

WSJ: A Secret for Patients Undergoing Hernia Repair