进入21世纪，品牌的竞争已成为市场竞争的核心内容，但中国本土品牌的成长却步履艰难，阻力重重。
After entering into the 21st century, brand competition has become the core of marketing competition, while the development of Chinese brand is very difficult.
测试内容应该包括效率、阻力、臭氧量等项目。
Testing content should include efficiency, resistance, concentration of ozone, and so on.
抗阻力练习应该作为疾病预防、体质改善的核心内容，而不是次要的或外围性手段。
Resistive exercises should be considered as the core content in disease prevention and constitution improvement, but not as a secondary or peripheral means.
作为管道输送工程设计的核心内容之一，管道阻力特性的研究具有重要意义。
As one of the key points in the design of a pipeline transport, study on the flow resistance of pipeline sand transport is of great significance.
试验内容包括光体和全附体的阻力试验，试验的结果采用二因次换算法，验证了理论计算的可靠性。
The test results are expressed by quadric conversion, and the reliability of the theory calculation is validated.
试验内容包括光体和全附体的阻力试验，试验的结果采用二因次换算法，验证了理论计算的可靠性。
The test results are expressed by quadric conversion, and the reliability of the theory calculation is validated.
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