Perhaps, similar to sails, they make a useful backup for when the lights go out.

也许，和风帆一样，它们作为备用品可以在熄灯的时候排上用场。

youdao

Perhaps, similar to sails, they make a useful backup for when the lights go out.

也许，和风帆一样，它们作为备用品可以在熄灯的时候排上用场。

youdao