物理性危险：指食品中发现的任何外来的对人类健康可能造成危害的物质。
Physical risk: refers to the food found in any alien to human health may cause harm to the material.
常见危险因素包括物理性、生物性和社会心理因素，常常发生在护理操作前、操作中及操作后。
Common risk factors, including physical, biological and social psychological factors, often happened in nursing before operation, during operation after operation.
结果表明，经选择后的新特征较好地描述了样本点的物理性质和发震危险点与安全点的差异。
As a result, the new feature after selection describes better the physical properties of the pattern points and the difference between safe points and dangerous points of earthquake occurrence.
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