translation.en: About 16,000 species of nematode worms have been discovered and diagnosed by scientists; there could be hundreds of thousands of them, even millions, still unknown.
translation.zh: 大约16000种线虫动物 已经被科学家发现并进行研究 而事实上，也许有数以千计甚至是数以百万计的我们还未曾知道