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.

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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.

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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.

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