这是因为，装上冷水器可以使一些留校参加课外活动的学生在天气炎热的情况下

这是因为，装上冷水器可以使一些留校参加课外活动的学生在天气炎热的情况下有冷水可以饮用以避免中暑的事件发生

結果 (英文) 1:

This is because, loading water cooler allows some to stay on campus for extracurricular activities of the students in case of hot weather there is cold water can drinking to avoid heat stroke events

結果 (英文) 2:

This is because the cold water can be installed so that some school students participating in extracurricular activities in hot weather conditions can have cold water to drink to avoid heat stroke incidents

結果 (英文) 3:

This is because cold water charging device can make some participation in extracurricular activities for students in hot weather is cold water to drink in order to avoid the occurrence of heat stroke events