(Chemical substances) can be harmful.Logical formLearned from26 sentences. Traffic can be harmful.Logical formLearned from26 sentences. A virus can be harmful to humans.Logical formLearned from26 sentences. Goods can be harmful.Logical formLearned from26 sentences. Side effects can be harmful.Logical formLearned from26 sentences. A substance can be harmful.Logical formLearned from25 sentences. A kind can be harmful.Logical formLearned from25 sentences. Stress can be harmful.Logical formLearned from25 sentences. Animals can be harmful.Logical formLearned from25 sentences. Air can be harmful.Logical formLearned from25 sentences. Materials can be harmful to minors.Logical formLearned from25 sentences. Presence can be harmful.Logical formLearned from25 sentences. Environmental factors can be harmful.Logical formLearned from25 sentences. A male may deem harmful to the economy.Logical formLearned from25 sentences. (Carbon dioxide emissions) can be harmful.Logical formLearned from25 sentences.