期望服务和用户群统计。
选择器使用选择条件来选择要调用的期望服务实现的目标。
The selector USES a selection criterion to choose a destination that is the desired service implementation to invoke.
否则，我们将不得不降低供应渠道的期望服务水准。
Otherwise, we would have to reduce the expectations of the supply channel service level.
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