Invariance
n. 不变性\\n[计] 不变性, 不变式
🗣️ 情景例句
I know a friend who can get us free tickets.
我认识一个可以给我们弄到免费票的朋友。
Did you go to the picnic this morning?
你今早去野餐了吗？
It's often cold in December, January and February.It snows sometimes.
12月、1月和2月常常很冷，有时还下雪。