// 3. 从后向前放置（保证稳定性）
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"Using firm contracts in uncertain situations carries significant commercial risks," says Albert Sanchez-Graells, a professor at the University of Bristol Law School who has been researching NHS contracts for more than 15 years.
Browser font fallback determines the threat. When a page specifies font-family: Arial, Helvetica, sans-serif and a string contains Cyrillic а, the browser checks Arial’s glyph tables, finds Cyrillic coverage, and renders it using Arial’s Cyrillic glyphs — which are pixel-identical to the Latin ones. The CSS font stack you ship determines which column of the danger rate table applies to your users. Arial at 40.8% is a different risk profile from Didot at 19.2%.
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