tangkai是part where the fruit, flowers etc; fruit stalks, flowers
https://prpm.dbp.gov.my/cari1?keyword=tangkai
gugus是objects that grow in large quantities on a stalk (fruits)
https://prpm.dbp.gov.my/Cari1?keyword=gugus
tangkai就是花果生长的地方(规模不大)
gugus就是花果生长的地方(超大串der)