但问题是，如果离子没有顺利通过电极栅，而是撞在上面，将会造成电极的烧蚀，从而限制了其使用年限，美国宇航局离子发动机的平均寿命约为3年。

The problem is, ions that bump into the grid instead of passing through it cause erosion, which limits the average NASA ion engine's lifespan to about 3 years.

youdao

但问题是，如果离子没有顺利通过电极栅，而是撞在上面，将会造成电极的烧蚀，从而限制了其使用年限，美国宇航局离子发动机的平均寿命约为3年。

The problem is, ions that bump into the grid instead of passing through it cause erosion, which limits the average NASA ion engine's lifespan to about 3 years.

youdao