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.

youdao

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.

youdao