asphalt content

例句：

1. 1. The road surface is made of asphalt to improve its abrasion resistance.
   路面是由沥青制成的，以提高其抗磨损能力。
2. 2. The asphalt content in the road is measured to ensure safety.
   测量道路中的沥青含量以确保安全。
3. 3. The asphalt content in the road is crucial for the vehicle's performance.
   道路中的沥青含量对车辆的性能至关重要。