Unfortunately, it's so vast, you'd need a professional tour guide to help you find the gems.

数量是如此之庞大，以至于，多到您需要一个专业的导游，来帮助自己寻找珍宝。

youdao

Maybe I'll take a guided tour, might find himself went to Canada on a local guide accompanied, within the time stipulated in the visa.

我也许会参加旅行团，也许会自己去了加拿大在找一个当地导游陪同，会在签证规定的时间内回国。

youdao

" He deputizes himself as a tour guide to the human psyche, promising to find the triggers of sadness wherever they might lurk: "I will adventure to guess as near as I can, and rip them all up, from the first to the last, general and particular, to every species, that so they may be better described.

WSJ: Robert Burton | The Anatomy of Melancholy | Digressions on a Diagnosis | Masterpiece by Danny Heitman