concatenate;
concatenation;
concave;
concavity;
conceal;
concealment;
concede;
conceit
concentrated adj. 全神贯注的;
concentration n.集中;专注;浓缩;
concentric a. 同中心的,集中性的;
concept n.概念,观念,设想;
conception n.概念,观念,想法;
conceptive adj. 概念的;
concern n.关心,挂念;关系