Both automobiles and bicycles offer a convenient meansof public conveyance, with one of the marked differences between the two centered on pollution caused by the former.
汽车和自行车都提供公共运输的便利方式,两者的显著区别之一在于前者引起污染。
2
Both automobiles and bicycles offer a convenient meansof public conveyance, with one of the marked differences between the two centered on pollution caused by the former.
汽车和自行车都提供公共运输的便利方式,两者的显着区别之一在于前者引起污染。
3
Pipeline conveyance is a rather economic and safe meansof transportation. But the design and construction of pipeline under different geological constructions have different technical requirements.