A professor at Northwestern University proved conclusively that worry restricts the flow of the saliva, which leads to tooth decay.
一位西北大学的教授研究得出结论，忧虑拦阻人唾液的分泌，因此导致蛀牙。
The lifecycle of enterprise knowledge includes the periods of pregnancy, growth, maturity and decay, and there are knowledge flow and transformation in each period.
企业知识生命周期包括孕育期、成长期、成熟期和衰退期，每个时期都存在知识流动与转换。
The treatment can be used to describe the effect of cross angle and density ratio on the axial velocity decay in fully developed jet flow.
该法可较好地描述射流交叉角度、密度比对轴线上轴向速度的影响。
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