史前时代

yán jiū rén yuán xiāng xìn yóu yú nán nǚ zài shǐ qián shí dài de fēn gōng bù tóng dǎo zhì le tā men bù tóng de gòu wù fāng shì

研究人员相信，由于男女在史前时代的分工不同，导致了他们不同的购物方式。

Differing roles in prehistoric times have evolved into differing shopping styles, the researchers believe.

mì shí shì shǐ qián shí dài yī gè rì cháng de shè huì xíng wéi

觅食是史前时代一个日常的社会行为。

Foraging was a daily social activity in prehistoric times.