势在必行 imperative
Explanation
这个成语的意思是：从事情发展的趋势看，必须采取行动。说明做某事已到了非做不可的地步，不采取行动不行。它强调事情的紧迫性和必要性。
The meaning of the idiom is: from the trend of things, it is necessary to take action. It means that it is time to do something, as it is no longer avoidable. It emphasizes the urgency and necessity of action.
Origin Story
在古代，有一位名叫李白的诗人，他从小就喜欢读书，也喜欢写诗。有一天，他听说一位著名的书法家要来他家乡，于是决定前去拜访。他听说这位书法家正在一座寺院里，便赶忙赶了过去。寺院里人山人海，李白好不容易才挤到寺院的门口。这时，他看见一位老者，正坐在门口，手里拿着一支毛笔，在纸上挥舞着，写着字。李白好奇地走上前去，想看看老者在写什么。只见老者写了一首诗，诗中写的是对天下的期盼，希望天下太平，百姓安居乐业。李白仔细地读着诗，他觉得这首诗写得非常棒，充满了对美好未来的期盼。他心想，自己也要写一首好诗，来表达自己的心愿。于是，李白就坐在寺院的门口，开始写诗。他一连写了几首，都没有达到他想要的效果。这时，一位僧人走过来，问李白：“你在写什么诗呀？”李白说：“我在写一首表达我对天下的期盼的诗。”僧人听了李白的话，微微一笑，对他说：“天下太平，百姓安居乐业，这确实是人们的期盼。但是，天下太平，不是光靠期盼就能实现的。想要天下太平，必须要有行动，要付出努力才行。现在天下正处于混乱之中，我们要做的是团结一致，共同努力，为实现天下太平而奋斗！”李白听了僧人的话，深以为然，他觉得僧人说得很有道理。于是，李白决心不再只是空想，而是要付出行动，为实现天下太平而努力。他决定要去各地游历，见识天下风土人情，积累经验，然后写出更好的诗，来表达对天下的期盼，并激勵人們为实现天下太平而努力。
In ancient times, there was a poet named Li Bai who loved to read and write poetry since he was a child. One day, he heard that a famous calligrapher was coming to his hometown, so he decided to visit him. He heard that the calligrapher was staying in a temple, so he hurried over. The temple was packed with people, and Li Bai had a hard time squeezing through to the entrance of the temple. At this time, he saw an old man sitting at the entrance, holding a brush in his hand, writing on paper. Li Bai curiously walked up to see what the old man was writing. He saw that the old man had written a poem, the poem wrote about his hope for the world, hoping that the world would be peaceful and the people would live in peace and prosperity. Li Bai carefully read the poem, he felt that the poem was written very well, full of hope for a better future. He thought to himself, he should also write a good poem to express his wishes. So Li Bai sat down at the entrance of the temple and began to write poetry. He wrote several poems in a row, but none of them achieved the effect he wanted. At this time, a monk came over and asked Li Bai, “What kind of poem are you writing?” Li Bai said, “I'm writing a poem expressing my hope for the world.” The monk listened to Li Bai’s words, smiled slightly, and said to him, “Peace in the world, people living in peace and prosperity, this is indeed what people hope for. But peace in the world is not something that can be achieved just by hoping. To have peace in the world, there must be action, and efforts must be made. Now the world is in a state of chaos, what we need to do is to unite and work together, to strive for peace in the world!” Li Bai was convinced by the monk’s words, he felt that the monk was very reasonable. So, Li Bai decided to stop daydreaming and take action to strive for peace in the world. He decided to travel to different places, experience the local customs and people, gain experience, and then write better poems to express his hope for the world and inspire people to work towards peace in the world.
Usage
这个成语主要用于表达一种紧迫感，强调事情的必要性和不可避免性。它常用于强调行动的必要性，暗示着不做就会有不好的后果。
This idiom is mainly used to express a sense of urgency, emphasizing the necessity and inevitability of something. It is often used to emphasize the need for action, implying that inaction will have negative consequences.
Examples
-
为了赶上进度，我们必须势在必行！
wei le gan shang jindu, women bixu shi zai bi xing!
To catch up with the progress, we must act decisively!
-
改革开放是势在必行，也是大势所趋。
gaige kaifang shi shi zai bi xing, ye shi dashi suo qu.
Reform and opening up is inevitable and the trend of the times.
-
面对挑战，我们要勇于行动，势在必行。
mian dui tiaozhan, women yao yong yu xingdong, shi zai bi xing.
In the face of challenges, we must be brave to act, it is imperative.