cyclicsn.环状化合物cyclicadj.循环的；周期性的；环形的cyclic downturn周期性下降阶段cyclic changing周期性变化Cyclic peptides环多肽cyclic pressing循环压制cyclic-prefix循环前缀cyclic constant循环常数cyclic fracture旋回裂隙cyclic behavior循环性质cyclic forecast周期性预测cyclic addition环化加成