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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Use Proper Supplies: Every birder knows they need a good field guide and the right optics to see the birds, but summer birding requires some additional equipment.

利用合适的补给品：每个观鸟者都知道他们需要一个好的野外向导和准确的视觉来观察鸟，但夏季观鸟需要额外的装备。

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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