原始社会では、物々交換が行われた。

tbd

In primitive societies barter was used.

もし君が原始社会の一員で、たとえば食料を生産したいと思うならば、君がしなければならないことが二つある。

tbd

If you are a member of a primitive community and wish to produce food, for example, there are two things you must do.

If you are a member of a primitive community and you wish to produce, say, food, there are two things that you must do.

その人類学者は原始文化に関する講演をした。

tbd

The anthropologist delivered a lecture on primitive cultures.