求翻译：上午七点半在校门口集合，骑自行车到济南植物园。前三组同学帮助工人清理废纸垃圾等。第四组同学在花园附近立五个牌子，告诉游客们爱护花草树木。第五组同学们向游客宣传保护环境的重要性。上午十一点半结束，然后各自回家吃午饭。是什么意思？

Half past seven set at the school gate, riding a bicycle to Jinan Botanical Garden. Three group of students to help clean up waste paper and garbage workers. Fourth group of five students to stand in the garden near the sign, told the visitors love flowers and trees. The fifth group of students to t

7:30 a.m. at the school gate pools, riding a bicycle to Jinan Botanical Garden. Group 3 students before helping workers cleaning up litter and waste paper. Group 4 students in a garden near 5 brands, tell tourists love flowers and trees. Tourists, group 5 students to publicize the importance of the

In the morning seven and half in the school gate mouth set, ride the bicycle to the Jinan botanical garden.First three group of schoolmates help the worker to clean up scrap paper trash and so on.Fourth group of schoolmates set up five signs nearby the garden, tells the tourists to cherish the flowe

7:30 A.M. at the school gate, cycling to Jinan botanical garden. Three groups of students before helping workers cleaning up waste paper waste, and so on. Five brands of the fourth group of students near the Garden State, told the tourists take care of the plants and trees. The fifth group the stude

7:30 A.M. at the school gate, cycling to Jinan botanical garden. Three groups of students before helping workers cleaning up waste paper waste, and so on. Five brands of the fourth group of students near the Garden State, told the tourists take care of the plants and trees. The fifth group the stude