The maintenance and restoration process of existing aircraft required a large supply of wood.
这个过程对现有飞机维修和恢复需要大量的木材供应。
The one hour left is required for the regular system maintenance.
一个小时的左边是需要定期的系统维护。
Maintenance free operation, no need to add water, no equalizing charge required.
设计简洁，免维护，无需补水，不需均衡充电。
Maintenance free operation, no need to add water, no equalizing charge required.
设计简洁，免维护，无需补水，不需均衡充电。
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