Phase IV hammerstones are light and have many impact marks.

第四阶段的石锤很轻，且有很多击象。

Thankfully they were successful,   but the effects of those dark times still have a marked impact on people today.

值得庆幸的是，他们取得了成功，但那些黑暗时期的影响仍然对今天的人们产生显着影响。