Librational
a. libration的變形
??? 情景例句
I'd love to, but I have to be up early tomorrow.
我非常感謝，可是明天我得早起。
We continued to struggle up the steep slope of the mountain.
我們?yōu)榱伺实巧降亩钙拢粩嗟乇秶L辛勞。
I'm not sure we can wait that long.
恐怕等不了那么久了。