"我们自己感觉我们所做的只是沧海一粟。但因为那缺失的一滴，大海会变得更少。"

Simplified Meaning:

Every small action we take might seem insignificant on its own, like a single drop of water in a vast ocean. However, if you remove that tiny drop, the ocean would be just a little bit smaller. It means that even the small things we do matter and they contribute to a bigger picture. Imagine a beach clean-up event: one person picking up trash might not seem like much, but if everyone thinks their effort is too small to make a difference, the beach would stay dirty. However, when many people each pick up a little trash, together they can make the beach clean again. In life, this means that small acts of kindness or contributions you make, like helping a neighbor or donating to charity, actually add up and have a bigger impact than you might think. Everyone’s efforts are valuable and contribute to making the world a better place.