Stiffiness
硬度
🗣️ 情景例句
so we can get an early start.
这样我们可以早点出发。
You've got plenty of time. That's $7.65.
你还富有很多时间。请付7。65美元。
as the wave leaves the particles behind back to its starting point again.
当波浪把微粒留在身后时又回到出发点。