如果该飞机的设计飞行缓慢，长期使用，低螺距螺旋桨看到最好的性能。
If the plane is designed to fly slowly, use a long, low pitch propeller to see the best possible performance.
路面长期使用性能研究已成为国际道路工程界普遍重视的一项基础性研究。
The study of long term performance of pavement is now becoming to be an important field in road research.
具备卓越的耐高低温、防火、抗老化和耐紫外线性能，能满足室外恶劣环境条件下长期使用要求。
Possess excellent resistance to high temperature, fire protection, anti-aging and anti-UV properties, to meet the outdoor long-term use under harsh environmental conditions require.
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