phase phase#1
participant phase#1:actor#1 "勘察员" steps=ask#1
phase hole#21b40fca
participant hole#21b40fca:hole#21b40fca/actor#1 "分组员" steps=hole#21b40fca/ask#1
phase phase#2
participant phase#2:hole#7c7fc07b/actor#1 "排序员" steps=hole#7c7fc07b/ask#1
phase phase#3
participant phase#3:actor#2 "执行者" steps=ask#2
