Technology according to Collins Cobuild refers to methods, systems, and devices which are the result of scientific knowledge being used for practical purposes.
Open letter according to the author of this blog is something like the following ramble:
What's a letter? A letter is the content inside of an envelope. (If you want a better written explanation to this question please check with Collins Cobuild)
What's an open letter? The opposite of an unopened letter.
Unfortunatrly, my unopened open letter was returned to me.
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