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Similar to the `std` counterpart, elements may be accessed directly by their key with bounds checking using <<ref_object_at>>, or without bounds checking using <<ref_object_operator_lb_rb>> which creates a null element if the key does not already exist:与 `std` 对应容器类似,可通过 <<ref_object_at>> 使用边界检查直接按键访问元素,或通过 <<ref_object_operator_lb_rb>> 进行无边界检查访问(若键不存在则创建空元素):</ref_object_operator_lb_rb></ref_object_at>