Grammar Note
可数：a digital（数字期权）、digitals（琴键）；不可数：digital（数字技术/设备）。
数字设备；数字技术
digitals — plural of digital
先理解核心含义，再看它在真实句子里的用法。
数字设备；数字技术
digital equipment or technology
After working with film for years, the photographer finally moved to digital.
从事胶片摄影多年之后，这位摄影师终于转向了数字技术。
数字期权
A digital option.
数字设备或技术
Digital equipment or technology.
钢琴或类似乐器的琴键
Any of the keys of a piano or similar instrument.
Many libraries are moving their archives to digital to make them accessible online.
许多图书馆正在把档案转为数字形式，以便人们在线查阅。
The company plans to invest more in digital over the next few years.
公司计划在未来几年加大对数字技术的投入。
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可数：a digital（数字期权）、digitals（琴键）；不可数：digital（数字技术/设备）。
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.