注意：研究人员并未考虑研究对象所居住环境中是否有隔音屏障以及居住楼层的差别，这些因素会影响暴露在交通噪音中的水平。
Caveat: the researchers couldn't account for the presence of noise barriers or the floor level on which the subjects lived, factors that would influence traffic-noise exposure.
然而，非洲卫生工作组发现，真正能留住卫生工作者的因素往往是装备的改善、安全的居住环境和培训的可及性。
Yet the Africa Health Workforce team found that it was often improved equipment, safe housing, and access to training that motivated workers to stay.
Sullivan也指出可能有复杂的因素比如营养不良或居住条件恶劣社会环境拥挤。
Sullivan also pointed to possible "complicating factors," such as malnutrition, poor housing or crowded conditions.
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