Some say that once the costs of power generation are factored into the equations, electric cars are only half as efficient with regard to energy use as modern diesel vehicles.
有人认为，一旦将发电成本综合考虑在内，在能源使用方面，电动汽车的效率只能达到目前现代柴油车的一半。
2
Regarding asphalt pavement as an axial symmetrical body of multilayered saturation elastic half space, the fundamental thermal Biot consolidation theory and seepage flow equations are introduced.
将沥青路面视为多层饱和弹性半空间轴对称体，引入比奥渗流固结理论和渗流方程。
3
I've spent the past three and a half years staring at grease boards full of equations.