例句與造句

1. Exogenously supplied aspartate is not an active precursor of asparagine in plant tissues .
   外來供給的天門冬氨酸，在植物組織中并不是一個(gè)活躍的天門冬酰胺前體。
2. It's difficult to find active precursor in a sentence. 用active precursor造句挺難的