momentous

US /məˈmen.t̬əs/
UK /məˈmen.t̬əs/
"momentous" picture
1.

重要的, 重大的, 有深远影响的

of great importance or significance, especially in its bearing on future events

:
The decision to go to war was a momentous one.
开战的决定是重大的。
This is a momentous occasion for our country.
这对我们国家来说是一个重要的时刻。