已知yǐzhīTop 9000Meanings1. known (to science)Characters used已already知to knowExamples1埃博拉Āibólā是shì人类rénlèi已知yǐzhī的de最zuì致命zhìmìng的de病毒bìngdú之一zhīyī。Ebola is one of the most virulent viruses known to man.