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发音：[moʊˈmentəs]
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例句：
- The word momentous refers to describe something of great importance or significance. It can be used to describe an event, decision, or action that has a significant impact on people or society.
- New data released this week by the Chinese government revealed that China’s population has begun to shrink, a momentous shift that will have broad ripple effects both domestically and globally.
- The country is suffering another momentous assault, a pandemic that has claimed about 400 U.S. lives every day for months now and has killed more than 1 million Americans.
- Investors are still grappling with the Fed’s momentous decision to raise interest rates by three-quarters of a percentage point.
- The discovery of life on Mars, either in the form of ancient fossils or subterranean reservoirs, would be one of the most momentous breakthroughs in human history.
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解释：
- Momentous这个单词做形容词使用，其表示“having great or lasting importance, often used in a positive sense, such as to describe a momentous achievement, discovery, or breakthrough”这一含义，即“关键的/重要的/重大的”，与consequential/important/significant/historic这些单词构成近义词。
- 注意，该单词除了上述用于积极场景的情况，也可以描述消极情况，表示“describe a momentous tragedy, disaster, or failure”，即“严重的/极其巨大的”。
- 具体使用场景如下：
- In 1873, Cambridge, like Oxford, was in the act of opening a state-of-the-art physics laboratory, and James Clerk Maxwell, the first Cavendish Professor of Physics at Cambridge, published his momentous Treatise on Electricity and Magnetism.（1873年，剑桥和牛津大学一样，正在开设一个最先进的物理实验室，剑桥大学第一位卡文迪什物理学教授詹姆斯·克拉克·麦克斯韦发表了他重要的《电和磁论》。）
—Science - Some of the government efforts may be misplaced or counterproductive, but this clash is not going away, and its outcomes will be both unpredictable and momentous.（政府的一些努力可能是错位的或适得其反的，但这种冲突不会消失，其结果将是不可预测的，也是严重的。）
—News - This jobs report is inconsequential because the economy is at a momentous inflection point — what matters is not what happened in the last few weeks, but where things end up several weeks from now.（这份就业报告无关紧要，因为经济正处于一个重要的拐点——重要的不是过去几周发生了什么，而是几周后事情的结局。）
—Business - On Tuesday, outside experts will meet and discuss the data to inform the Food and Drug Administration’s decision on one of the most momentous remaining questions for the pandemic.（周二，外部专家将开会讨论数据，为美国食品和药物管理局就大流行最重要的剩余问题之一做出决定。）
—Medicine
