-- means that you have a choice between 2 things, but both of them are bad.
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The government is building a 10-foot fence (3-metre fence) around downtown Toronto now for security for the G20 conference next week.
This blog is mainly to explain a different English language expression every day. Sometimes I post other stuff. I also have a YouTube channel which is mostly about computer software: https://www.youtube.com/englishspacedog