此时,混合物必须要用额外加入的燃料迅速地加浓.Then the mixture must be quickly enriched with extra fuel.天色逐渐加深, 而月亮的光辉也逐渐加浓.Gradually, as the blue of the sky deepened, the rays of the moon grew richer.对于一定的恒星形成频率,金属加浓最大的区域显然受到了最大的压缩.The region...

“加浓”的英语可以翻译为：[化] concentrate ...