to two (out of) ten of these green crabs is filled with this creamy-like
golden liquid.''
What does this sentence mean from a comprehension?
especially (out of) mean???????
by the way , what is the meaning of ''at once''?
please with example if you can.........
thank you very much,,,,,...........
更新1:
also,I want to ask what is the meaning of ''worth spending the money as good yellow oil crabs are not often found.''