Returns the number of contacts for the specified area.
返回指定区域的联系人数量。
Franchises often give exclusive rights for a specified area.
特许经营权通常给予受许人指定地区的独占权。
That is, this method opens a specified area of memory in which the existing data is treated as metadata.
也就是说,这个方法会开启现有资料被视为中继资料之指定的记忆体区域。
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