Malthusism
n. 人口论
🗣️ 情景例句
Bye-bye.
再见。
What day is tomorrow?
明天是星期几？
and so the tools of long ago have remained when even the bones of the men who made them have disappeared without trace.
因此，尽管制造这些工具的人的骨头早已荡然无存，但远古时代的石头工具却保存了下来。