I sent my opinion to the letters section of the newspaper.
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Refers to an input field or blank space in a form, web page, or application.
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Original meaning; now somewhat literary or seen in compound words like 欄干 (らんかん). In modern speech, 手すり is more common.
I leaned on the railing of the old bridge and gazed at the river.
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That article was published in the business section.
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They added a free-comment field to the survey.
reader's column; letters-to-the-editor column