Protolithic
a. 原始石器时代的
🗣️ 情景例句
You've come up with a good idea.
你想出来的主意好极了。
I hople yu can do well in the examinationgs.
我希望你的考试能成功。
It is all too easy to blame the railway authorities when something does go wrong.
因此，一旦铁路上真出了问题，人们便不加思索地责备铁路当局。