He built secret passages underground, and his secret house on the lake.

他建造了地下秘密通道和他的湖上秘密居所。

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These secret passages were not for his entertainment in old age, but a result of cross-strait military confrontations.

这条密道可不是老人家的晚年娱乐，而是两岸军事对峙时期的产物。

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I will hire a team of board-certified architects and surveyors to examine my castle and inform me of any secret passages and abandoned tunnels that I might not know about.

我会聘用一群合格建筑师组成委员会，仔细的检查我的堡垒，是让我知道所有的密道跟我可能不知道的废弃管路。

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The easiest was ridiculously easy, though it allowed players to find the various secret passages without just dying over and over again.

FORBES: Are Really Hard Games Unpopular?

The audience then walk through secret, maze-like passages beneath the ground that are rarely seen by the public, leading them from one building to the next.

BBC: News, London

At the summit, visitors are rewarded with stunning panoramic views of the city and its surroundings, while inside a world of secret rooms, museums and unexpected passages awaits.

BBC: Under-explored day trips from top European cities