He drifted about the house like a rudderless vessel in a rocky stream.

他在房子周围转来转去，像一艘没有舵的小船在布满礁石的河流。

The Brygmophyseter uses its flipper to steer, it is literally rudderless without it.

四贺鲸用它的鳍肢来控制方向，没有它真的就没有方向了。

Now, you have to understand, the kids are gone, the nest is empty. They are rudderless.

因为你不得不适应孩子们也走了，巢也空了。她们一下子没着没落的。