d

• A digraph d is unilateral .
  图D是单连的。
• The condensation of d is a directed graph with m vertices .
  D的凝聚图是指一个有m个顶点的有向图。
• A faint smile fluttered over mrs. van der luyden's face .
  范德路易登夫人的脸上飘过一丝淡淡的微笑。
• The above sequence of events is illustrated in fig. 2. 2 a-d .
  上述事件的先后顺序由图22a-d说明。
• Van der wals forces between neutral atoms are called dispersion forces .
  中性原子间的范德华力叫做色散力。
• The indegree of a vertex v in d is the number of arcs with head .
  VD中顶点V的入度是指以V为头的弧的数目。
• Antibodies were used in the macrophage system to inhibit cathepsin d .
  巨噬细胞系统中使用了抗体来抑制组织蛋白酶D。
• The fat-soluble vitamins(a, d and e)seem to be impeded by the placenta .
  似乎胎盘阻碍脂溶性维生素（A，D和E）的通过。
• One case of particular importance corresponds d=o, i.e. the two lenses are in contact .
  一个特别重要的情况是do，即两个透镜相接触。