n. 五；五个一组；五年间；五价物
词根：pentad
adj.
pentamerous [植] 五基数的；[昆] 五跗节的；由五个部分组成的
1.The annual variation appears a tri-peak form in the curve of dekad- or pentad-hail days evolution.
从旬或候雹日演变看，冰雹年变化具有三峰型；
2.The annual variation appears a tri-peak form in the curve of dekad- or pentad-hail days evolution.
从旬或候雹日演变看，冰雹年变化具有三峰型；
3.The average PCD in Altay region was 0.205; the average PCP was the 38.12 pentad.
阿勒泰全区汛期降水平均集中度为0.205，平均集中期为第38.12侯。