1. 重大的;关键的;有影响的
[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;If you refer to a decision, event, or change as momentous, you mean that it is very important, often because of the effects that it will have in the future.

1. of very great significance

[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;e.g. deciding to drop the atom bomb was a very big decision
[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;[…]nbsp;a momentous event