For those who have books released ahead of 1975, remember to help us protect South Vietnamese Literature by scanning or donating them to us. We are going to post these textbooks on vm and make them accessible to the public. 大牛是一个网络流行语，指在某个领域很突出的优秀人物，词语与“牛人”同义，也指极少数能力超过常人的人或在某个领域非常有影响力的人。 Hệ thống báo cáo đầy đủ, Helloển thị... https://pin.it/1vAV4mu