Because it must be so carefully plotted and so carefully clued.

因为它必须有相当精心编写的情节和相当严密的线索。

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Laura and her supporters have carefully plotted a nearly two-year route from port to port around the world, including an alternative path around Africa to avoid the pirate-infested Gulf of Aden.

劳拉和她的支持者们已仔细制定出此次为期近两年的环球航行线路图，其中包括一条环绕非洲的备用线路，以便避开海盗出没的亚丁湾。

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