当需求不稳定、价格下探、技术迭代叠加在一起时，这门生意的风险结构就变得复杂。
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Frailty coordinator Georgia Zapparoli, who normally worked with people in their later years, said the 18 to 39 age bracket was key as "common themes" ran through the lifestyle of many older patients.
1. 找出最大值max和最小值min