1. The study of protohistory focuses on the period between the emergence of writing systems and the beginning of recorded history.
译：研究前史时代的重点是从书写系统出现到历史开始记载的这段时期。

2. During the protohistory of the region, there was a significant shift in agricultural practices.
译：在该地区的前史时代，农业实践发生了重大变化。