Dr.Nissen points out that many over the counter drugs - aspirin,ibuprofen, acetaminophen or paracetamol - can be toxic if used improperly.

VOA: standard.2010.03.02

So, we can do that by using this equation, which is for s orbitals is going to be equal to dr 4 pi r squared times the wave function squared, d r.

用这个方程,对于s轨道，径向概率分布,4πr的平方,乘以波函数的平方,这很容易理解。

麻省理工公开课 - 化学原理课程节选

Dr.Newman says the diagnostic test can be performed at all levels of the health system, including community settings.

VOA: standard.2010.03.09

Dr.Vallenas says there is a widespread misconception that stress or inadequate nutrition, commonly seen during emergencies, can prevent mothers from breast-feeding successfully.

VOA: standard.2009.08.01

Dr.Martin says,by monitoring the progress of multiple patients from infancy through adulthood, doctors can gather crucial evidence about the effectiveness of the procedures."

VOA: standard.2010.01.01

Dr.Brook says just one to two hours of breathing automobile exhaust in traffic can be deadly.

VOA: standard.2010.08.04

Dr.Ahmed says people can also adjust their lifestyles: such as abstain,from smoking, indiscriminate sexual inter-course and refrain from factors known to be associated with cancer, such as drug abuse. The Nigeria Cancer Society is working with NGOs to create public awareness campaigns that include radio and television advertisements, handbills,pamphlets and other educational materials that are distributed in schools, hospitals and other public places.

VOA: standard.2010.06.16