Roewe 750S 1.8T Xunya Edition, 750D 1.8T Shang Ya Edition and 750E 1.8T Qiya Edition. What do the s, d and e here mean respectively?

S- continuous multi-point fuel injection engine T- turbocharged engine E-ES- single-point-injection gasoline engine EM- multi-point-injection gasoline engine actually means injection engine, which is a single-point injection engine when connected with S, and a multi-point injection engine when connected with M, which is very troublesome. The book I just checked ... Hee hee, extra points. ....