1. The subbase of the road needs to be properly compacted to ensure a stable foundation.

这条路的底基层需要被充分压实，以确保稳定的基础。

2. The subbase material should be strong enough to support the weight of heavy vehicles.

底基层的材料应该足够坚固，能够承受重型车辆的重量。

3. Before laying down the asphalt, the subbase must be thoroughly inspected for any defects.

在铺设沥青之前，必须彻底检查底基层是否有任何缺陷。

4. Proper drainage is essential to prevent water from seeping into the subbase and causing damage.

正确的排水是必要的，以防止水渗入底基层并造成损坏。

5. The subbase acts as a support layer for the pavement above it.

底基层充当了上面路面的支撑层。

6. The construction crew is currently working on preparing the subbase for the new building project.

施工队目前正在为新的建筑项目准备底基层。