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飞鸽传书距离有限，北方的一些地方太过遥远，所以要设立一些中转之处。【影片花絮】　　依然是最清蜜的爱情蜜语，依然有最珍贵的幸福，都在前方不远处，你是否已经准备好在下一秒邂逅你的清蜜恋人呢？眼睁睁地看着数十褐衣骑士，从身边绕过，扑向马车，心中焦急万分。"Teacher, when I synthesize crystals, I need to find different conditions to synthesize them, but there are too many tests. Do you have any better methods?" "What do you synthesize crystals for?" "Of course, it is to test its performance." "Then why do we stick to the need to synthesize crystals before testing properties? We can test properties with the results of each time. Maybe we can find better substances, can't we?" "Ah! Yes, thank you, teacher, I'll try it!" In an exchange with Mr. Sun Yimin, the teacher proved once again the correctness of the sentence "Don't stick to books and documents" while solving the problems of the team members.OK, you may have succeeded a lot here, but you will find that you can't go on, because he will let you choose an installed file to proceed to the next step. At this time, we haven't installed any usable files, so we need to install GCC program.