Hi Allen, The first sentence means lessons are over. The second means something usually happens between mid July and end of August. Hope this helps. Cheers, Lance

1.上完课mean the teacher complete their lesson 2.the second sentence Normally it is from middle of July to ends of August

大学老师上完课可以在家备课。 When a university lecturer finishes class he may be at home preparing for other classes. 你们的暑假什么时候？ When do you have summer break? 一般从七月中旬到八月底 normally from 11th July to till the end of August.

hi Allen, 1."上完课“ means the the time point when teacher has finished his/her class. "完“ often refer to "finish" "over" 2. "从七月中旬到八月底” means from the mid July to the end of August。 “一般” works like "generally speaking"