If s designates the sum of ages of employees 30 years and older across all slices and if s I is the sum within the i-th slice, it is easy to see that s is the sum of si.
如果s指定所有片上的年龄在30岁以上员工的年龄总和并且如果s i是第i片内的总和，那么很简单，S就是Si的总和。
A region of eastern European U. s. s. R. in the southern Ural Mountains. It came under Russian control in the 'th century.
俄罗斯欧洲部分东部一个地区，位于乌拉尔山脉南部。它在'世纪被俄国所控制。
A region of eastern European U. s. s. R. in the southern Ural Mountains. It came under Russian control in the 'th century.
俄罗斯欧洲部分东部一个地区，位于乌拉尔山脉南部。它在'世纪被俄国所控制。
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