Okay, the user wants me to translate "yellow-eyed grass" into Simplified Chinese. Let me think about the correct term for this.
First, "yellow-eyed grass" is a plant, so I need to find its scientific or common name in Chinese. I recall that there's a plant called "黄花茅" in Chinese, which is the translation for yellow-eyed grass. Let me verify that.
Checking some botanical resources, "yellow-eyed grass" is indeed known as "黄花茅" in Chinese. It's a type of grass with yellow flowers, hence the name. The user specified to use Simplified Chinese, so "黄花茅" is already in Simplified form.
I should make sure there's no other possible translation. Sometimes, plants have multiple common names, but in this case, "黄花茅" seems to be the standard term. Also, the user mentioned if the content is already in Simplified Chinese, output it unchanged. Since "yellow-eyed grass" is an English term, translating it to "黄花茅" is correct.
No need to add any explanations, just the translation. So the answer should be "黄花茅".