因此，在过去三年中，这家公司和他们在海外的供应商都开始储备更多的邮政机械零部件。
So over the past three years, the company and its overseas suppliers have begun stockpiling more postage-machine components.
同样不需要为多个系统储备许多备用部件，只需为一个单一平台留有备件即可。
Also, rather than needing to stock replacement parts for multiple systems, only spares for a single platform are required.
矿井通风系统是一个复杂、时变、含有冷储备部件的可修系统。
The mine ventilation system reliability is a maintainable system with complex, change with time and contain cool-stock components.
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