Okay, the user wants me to translate "biological catalyst" into Traditional Chinese. Let me think. The term "biological catalyst" is commonly known in science, specifically in biology and chemistry. The catalyst here refers to enzymes, which are biological molecules that speed up chemical reactions.
In Chinese, "biological" is usually translated as "生物" (shēngwù), and "catalyst" is "催化劑" (cathuànjì). So combining them, it should be "生物催化劑". Wait, but sometimes enzymes are directly referred to as "酶" (méi). However, the user specified to translate the given term, not replace it with a synonym. So "biological catalyst" is more accurately "生物催化劑" rather than "酶".
I should check if there's a standard translation. Let me recall. Yes, in academic contexts, "生物催化劑" is the direct translation. The user also mentioned that if the content is already in Traditional Chinese, leave it as is. Since the input is in English, I need to translate it. So the correct translation should be "生物催化劑".