s. of very great significance
a. 重大的, 重要的
1. This was a momentous decision that changed the course of history.
这是一个具有重大意义的决定，改变了历史的进程。
2. The momentous event was celebrated by people all over the country.
这一重大事件得到了全国人民的庆祝。
3. She felt a momentous shift in her life when she graduated from university.
当她大学毕业时，感到生活中发生了重大的转变。