Grammar Note
ink 表示墨水时通常不可数；表示种类、颜色或一瓶/一罐时可数，复数形式为 inks。
墨水
先理解核心含义，再看它在真实句子里的用法。
墨水
A colored liquid used for writing, printing, or drawing.
I accidentally got ink on my new shirt while writing with a pen.
我写字时不小心把墨水弄到了新衬衫上。
用于书写、印刷等的颜料或染料基液体。
A pigment (or dye)-based fluid used for writing, printing etc.
用于印刷、书写或绘画的液体
a liquid used for printing or writing or drawing
这种液体的特定类型、颜色或容器。
A particular type, color or container of this fluid.
墨鱼及其他头足类动物喷入水中的黑色保护性液体
dark protective fluid ejected into the water by cuttlefish and other cephalopods
The printer is making a strange noise, so I think it has run out of ink.
打印机发出奇怪的声音，我想是墨水用完了。
This bright red ink is perfect for signing official documents.
这种亮红色墨水非常适合签署正式文件。
Choose the next layer that will help you use ink with more confidence.
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ink 表示墨水时通常不可数；表示种类、颜色或一瓶/一罐时可数，复数形式为 inks。
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.