For thousands of years humanity has been using the cannabis plant to treat various medical conditions. The ancient Chinese, Egyptian and Greek people's all recognized the immense medical potential of this often-misunderstood plant. Thousands of years later, in the most technologically advanced age of human history, medical marijuana is a controversial topic. The early 20th cent...$像是科教片。医学知识还是挺丰富的。但画面与讲述的内容，时常是毫无关联。不及格啦 5/10
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