Roof racks increase the car's weight and reduce aerodynamic efficiency, which increases the amount of fuel burnt to power the car.
行李架增加车子的重量，降低空气动力学功效，那会增加车辆燃烧的燃料量。
Roof is composed of heterogeneous rock. When roof failure happens, a large amount of energy would release in the form of seismic wave.
顶板是一种典型非均质岩石材料，在其破坏演化过程中将释放能量产生地震波。
Through the analysis of the load-deflection curves of prestressed concrete roof trusses, it is shown that these trusses deflect a considerable amount in the state of ultimate strength.
本文通过对预应力混凝土屋架的荷载-挠度曲线分析，说明预应力混凝土屋架在强度极限状态时，屋架的挠度是不小的。因此，由屋架的变位引起的上弦次弯矩影响是不可忽略的。
Through the analysis of the load-deflection curves of prestressed concrete roof trusses, it is shown that these trusses deflect a considerable amount in the state of ultimate strength.
本文通过对预应力混凝土屋架的荷载-挠度曲线分析，说明预应力混凝土屋架在强度极限状态时，屋架的挠度是不小的。因此，由屋架的变位引起的上弦次弯矩影响是不可忽略的。
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