Invariants
(invariant 的復數) a. 無變化的, 不變的\\nn. 不變量
??? 情景例句
Where did the time go?
時間溜的真快！
We can offer a discount in progressive stages according to the size of the order.
根據訂購數量的大小，我們可提供累進的折扣。
One would expect them to know their parts by heart and never have cause to falter.
人們以為，這些演員一定會把臺詞背得爛熟，絕不會臨場結巴的，