Esso Research and Engineering Company has already devised a system for clearing urban roadways that is reported to be cheaper than under-pavement steam or electric coils.
埃索研究工程公司已经开发了个郊区道路清理系统，据报道会比人行道下的蒸汽电力圈更为便宜。
2
Combined with medium pressure steam heat-supply engineering, the applicability of square compensator, ball compensator and rotary joint compensator is discussed.
结合某中压蒸汽供热工程，探讨了方形补偿器、球型补偿器、旋转补偿器的适用性。
3
The trajectory of human engineering and technology innovation is from the steam age, the electrical age to the digital era and the wisdom of the times.