维持需要 meaning in English

maintenance requirement

Maintenance needs to relate to the size of the animal but there are economies of scale .
家畜的维持需要与它的体格大小有关，并且还存在一种比例关系。
Successful web planning , designing and managing will require specialised knowledge
成功的网站策划，设计和日后的管理维持需要专门的技术知识。
Endothelial dysfunction plays an essential role in initiation and progression of atherosclerotic diseases
内皮功能完整性的维持需要通过细胞间不同的机制调整其活性。
A comparative study on nitrogen metabolism and nitrogen requirement for maintenance in roosters and layers fed antibiotic - free diets
公鸡和母鸡氮代谢及氮维持需要量的比较研究