darklyadv.暗黑；暗中darkadj.黑暗的；深色的n.黑暗；暗处；深色调v.使变黑；变黑dark operation in open tunnel明洞暗作dark-colored femic minerals铁镁暗色矿物darkroom for film development洗片暗室Dark clouds were gathering.乌云正在密集。dark object subtraction model黑体减法模型Darkness closed in upon us.暮色笼罩着我们。Dark hair and ruddy complexion绿鬃朱颜Dark clouds betoken a storm.乌云予示着暴风雨的来临。Dark learning in Weijin period魏晋玄学dark field illumination method暗(视)野照明法

1. In the center, the three huge dark dust lanes that give the Trifid its name all come together.
   在星云中央，三道巨大的尘埃暗带会聚在一起，使这个星云以三裂星云为名。