发动机的好坏是决定摩托车质量优劣的关键。挑选时，注意观察发动机的位置、

发动机的好坏是决定摩托车质量优劣的关键。挑选时，注意观察发动机的位置、发动机的起动挂档是否灵敏、是否有杂音等。

結果 (英文) 1:

Engine is the key to quality for motorcycles. When selected, observe engine, engine starter gear noise is sensitive and so on.

結果 (英文) 2:

The quality of the engine is the key determinant of the quality of the merits of the motorcycle. The selection, observe the location of the engine, the engine start-gear is sensitive, if there is noise and the like.

結果 (英文) 3:

The engine is good or bad is the key to determine the quality of the motorcycle. When selected, pay attention to the location of the engine, the engine is sensitive to the start of the file, whether there is noise, etc..