The paper compares the theoretical initiation process of a Taishan 25 tractor engine with its practical process.

比较了泰山25型拖拉机机组的理论起步过程与实测起步过程。

youdao

The technology isn't new-a patent for a hydrogen internal combustion engine was issued in 1928, and a 20hp fuel-cell tractor was demonstrated in the late 1950s.

FORBES: Magazine Article

During the hearing the HSE said the tractor's starter motor had been faulty for at least two months and staff had been starting the engine by using a screwdriver or spanner to short the connection.

BBC: Leicester