这条大船的马达坏了，无法再航行了。

With its engine broken, this great ship was not navigable.

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当补给小组把物资送达之后，他们必须再反向重复一遍这样的航行。

After they have dropped off our supplies they then have to repeat the process in reverse.

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达尔文的大部分朋友关系靠通信维持，在他年轻时乘坐英国皇家海军舰艇“小猎犬”号进行了五年的航行后，几乎没有再离开过他在英国乡下的老家。

Most of Darwin's friendships were conducted through the mail, and after his five-year voyage on HMS Beagle as a young man, he rarely left his home in the English countryside.

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