The drug is not harmful per se, but is dangerous when taken with alcohol.
这种药本身无害，但与酒同服就危险了。
The drug is to be reclassified after trials showed it to be more harmful than previously thought.
试验显示这种药比先前想象的危害更大，要重新归类。
Such laws could protect the consumer from harmful or dangerous remedies
这样的法规可以保护消费者免受有害或者危险药品的威胁。
Mr Campbell said such programmes were by their very nature harmful
坎贝尔先生说此类节目本质上就是有害的`。
Radon is known to be harmful to humans in large quantities
众所周知，大量的氡会对人体造成伤害。