How can San Francisco gradually become a paradise for drug users?

When it comes to San Francisco in the United States, what do you think?'Silicon Valley' may be the first word that pops into people's minds, and countless well-known technology giants, such asAppleGoogleTwitterFacebookThey are all located here.In the imagination of many international students who aspire to work in North American technology giants, Silicon Valley should be filled with energetic technical personnel, each with an expensive cup of cold squeezed juice, eagerly leading the digital revolution in the office...

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