绿色植物是陆地生态系统中最主要的生产者。

Green plants are the main ___producers in terrestrial ecosystems.

这部音乐剧的制片人邀请了知名演员加盟。

The ___producers of the musical invited famous actors to join.

这些本地生产商为超市供应有机牛奶。

These local ___producers supply organic milk to the supermarkets.