These chemicals are harmful in large amounts, and are often a sign of toxicity or disease, so it makes sense our noses tell us that's bad, but there's probably not enough in a couple of farts to do any damage.

这些化学物质大量有害，通常是中毒或疾病的征兆，因此我们的鼻子告诉我们这是有道理的，但放几个屁可能不足以造成任何伤害。