他们实际上创造了一种“路标”来告诉自己该通往哪个方向。

They actually create a type of "road sign"to tell themselves which way to go.

youdao

他们实际上创造了一种“路标”来告诉自己该通往哪个方向。

They actually create a type of "road sign"to tell themselves which way to go.

youdao