Plainly
来自Big Physics
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wiktionary
From Middle English playnly, pleinly, pleyneliche, equivalent to plain + -ly.
etymonline
plainly (adv.)
late 14c., "frankly, candidly; without a doubt, truly; in a clear and distinct manner; simply, straightforwardly," from plain (adj.) + -ly (2). Meaning "simply, frugally" is from 1560s.
