If you enter your presentation and people immediately don't think that you're trustworthy, then your presentation is going to fall flat.

如果你在演讲，人们立即认为你不值得信赖，那么你的演讲将很失败。

The expression to fall flat means that a person tries to do something but it doesn't work.

fall flat 的表达意味着一个人试图做某事但它不起作用。

Another Biden administration effort that has appeared to fall flat is a decision to release a million barrels of oil daily from the Strategic Petroleum Reserve.

拜登政府的另一项努力似乎没有取得成效，那就是决定每天从战略石油储备中释放100万桶石油。

Because, no matter how exciting your idea is, if you can't tell a story that truly engages other people and make people feel excited about the idea, the whole thing is going to fall flat.

因为，无论你的想法多么令人兴奋，如果你不能讲述一个真正吸引其他人并让人们对这个想法感到兴奋的故事，那么整个事情都会失败。