树: tree形状: form; appearance; shape; fas ...笔石: graptolite群体: population; colony group分枝: branch; virgation; sprouting ...笔石群体: rhabdosome树形笔石目: dendroidea痕迹化石群体: ichnocoenosis群体分类: group classification群体分析: group analytic电子群体分析: electron population analysis树形: tree form笔石: (古无脊椎动物) graptolite◇笔石纲 graptolithida; 笔石体 rhabdosome; 笔石相 graptolithic facies掌状笔出的: digitate分枝: branch; virgation; sprouting; growth; arm; sprig (神经,血管的) 他的专业是心理学, 这是知识之树上的一个重要分枝。 his speciality was psychology -- one important branch on the great tree of knowledge化石群: colony; fossil coenosis; orictocoenosis陨石群: meteoric stream; meteoric swarmt群体: t grou群体: 1.[生物学] population; colony2.[社会学] group 次属群体 secondary group; 首属群体 primary group; 小群体 samll group; 指涉群体 reference group; 群体发育 astogeny; 群体规范 group norm; 群体精神 community spirit; 群体密度 population density; 群体凝聚力 group cohesion; 群体认同 group identification; 群体生态学 synecology; 群体生物学 population biology; 群体效应 population effect; community effect; 群体行为 group behavior; 群体选择 group selection; 群体压力 population pressure; 群体遗传学 population genetics; group consiousness 形状: form; appearance; shape; fashion; likeness 保持它的形状 keep [hold; retain] its shape; 所有圆的形状都是相同的。 all circles have the same shape. 汽车的形状已有很多改进。 there have been many improvements in the form of cars 化石群集: palebiocoenosis化石群聚: fossil biocoenosis化石群落: fossil community; fossil-coenosis; in place assemblage; in-place assemblage混合化石群: mixed assemblage砾石群落: petrium