NASA has looked at gravity countermeasure suits for spacewalking in the past, but tabled the research due to technical and operational issues.

美国宇航局曾经研究过提供重力的宇航服，但是由于技术和操作问题束之高阁。

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Finally, we then from the engine management point of view, analyze the technical issues and solutions in selecting an optimal ship operational speed.

最后从轮机管理的角度出发，分析选择最佳经济航速运行时，存在的技术问题及相应的对策。

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Finally, we then from the engine management point of view, analyze the technical issues and solutions in selecting an optimal ship operational speed.

最后从轮机管理的角度出发，分析选择最佳经济航速运行时，存在的技术问题及相应的对策。

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