Jackladder
n. 木踏板绳梯, 跳板
🗣️ 情景例句
You don't sound very enthusiastic.
你似乎不太热衷。
See you later!
到时候见啦！
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。