求翻译：明天早上七点半在学校门口集合，骑自行车到济南植物园， 班级分为三组，第一组负责清理草坪上的垃圾，第二组负责向游客宣传环保知识，第三组负责监督游客将垃圾带走，十二点在门口集合，各自回家吃饭是什么意思？

7:30 am tomorrow at the school gate collection, ride a bike to Jinan Botanical Garden, the class is divided into three groups, the first clean up the garbage on the lawn, the second group is responsible for the knowledge to promote environmental awareness to visitors, tourists will be responsible fo

7:30 a.m. tomorrow at the school gate, riding a bicycle to the Jinan botanical garden, the class was divided into 3 groups, the first of which is responsible for cleaning up litter on the lawn to the tourists, Group 2 is responsible for environmental awareness knowledge, Group 3 is responsible for o

Early morning seven and half in the school entrance set, will tomorrow ride the bicycle to the Jinan botanical garden, the class and grade divides into three groups, the first group will be responsible to clean up in the lawn trash, the second group will be responsible to the tourist to propagandize

At the school gate tomorrow 7:30 A.M., cycling to Jinan Botanical Garden, the class is divided into three groups, the first group is responsible for cleaning up garbage on the lawns, the second group is responsible for visitors to promote environmental knowledge, the third group to oversee the touri

At the school gate tomorrow 7:30 A.M., cycling to Jinan Botanical Garden, the class is divided into three groups, the first group is responsible for cleaning up garbage on the lawns, the second group is responsible for visitors to promote environmental knowledge, the third group to oversee the touri