例句與造句

1. This is achieved despite a lower zinc and phosphorus additive level as called for by the API CJ-4 specification . ( The 15W-40 Rotella T with Triple Protection oil has approximately 1200 ppm of zinc and 1100 ppm phosphorus at the time of manufacture .)
2. It's difficult to find additive level in a sentence. 用additive level造句挺難的