It'll have to operate for long periods of time in very cold temperatures.
它必须长时间在非常低的温度下运行。
They have to operate for long periods of time before the costs of development have been recovered.
在收回开发费用之前，它们必须运作很长一段时间。
It sets the baseline information context in which all services will operate for the project across all participating lines of business.
它设置基准信息上下文，所有参与业务线的项目的所有服务都将在此上下文中操作。
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