1. Hearn had been suffering from chronic fatigue and was diagnosed with a bad aortic valve, which he had replaced. 2. That scared her enough to go to her doctor, who discovered she had a bad aortic valve. 3. We replace bad valves on mechanical pumps all the time, he thought. 4. NASA also is contending with bad valves aboard Discovery. |
每页显示:
共 4 句