- 重点词汇
- 数字
number; numeral; digit; figure; count; numeric; numerical; digital
- 单位
unit; work unit; organization; institution
- 字母
letter; character; lettering; grapheme; alphabetical; alphabetic
- 表示
express; show; mean; signify; convey; denote; betoken; indicate; extend; represent; stand for; manifest; present; pronounce; expression; marker; indication; representation; manifestation; expressive; for