cobalt
cobalt — noun
1. a hard, shiny silver-white metal that exists as a chemical element in nature. Ma
a hard, shiny silver-white metal that exists as a chemical element in nature. Manufacturers mix it with other metals to create strong alloys and use it to give glass and paints a deep blue colour.
Cobalt is widely used in batteries for electric cars and portable electronic devices.
uncountable noun used as subject in a general statement
Maria examined the cobalt sample under a microscope in the university laboratory.
cobalt as a modifier: cobalt sample
Omar read that cobalt mining provides jobs but also raises environmental concerns.
The factory recycles cobalt from old smartphone batteries to reduce waste.
Hiroshi noticed that cobalt gives a brilliant blue colour to certain types of glass.
文法句型
cobalt + noun (e.g., cobalt mining, cobalt alloy)
用法筆記
Uncountable in this sense; do not use with a or an. Frequently appears as a compound modifier before a noun (cobalt alloy, cobalt mining, cobalt pigment).
常見錯誤
2. a deep blue colour that sometimes has a hint of green, named after the blue pigm
a deep blue colour that sometimes has a hint of green, named after the blue pigment originally made from the metal cobalt.
The painter chose a rich cobalt for the sky in her landscape painting.
adjective + cobalt (uncountable)
Sofia decorated her living room in shades of cobalt and warm grey.
shade of + cobalt
The museum displayed a Ming vase decorated with cobalt and white patterns.
Lena painted her cabinets in a shade of cobalt that reminded her of the sea.
For the company logo, the designer picked a bright cobalt that stands out on white.
- ultramarine
a very deep blue, slightly more purple than cobalt
- navy blue
a very dark blue, less bright than cobalt
文法句型
[adjective] + cobalt
shade / tone of cobalt
用法筆記
Can be used with both countable patterns (a bright cobalt) and uncountable patterns (shades of cobalt). Deep, rich, and bright are the most common modifiers.
常見錯誤
cobalt — adjective
- cobaltpositive
- more cobaltcomparative
- most cobaltsuperlative
1. describes a material or object that is a deep shade of blue, sometimes with a hi
describes a material or object that is a deep shade of blue, sometimes with a hint of green, like the colour made from the metal cobalt.
The artist used cobalt paint to create the deep blue waves in the seascape.
cobalt + noun (paint)
David admired the cobalt tiles on the roof of the old mosque.
Aisha bought a cobalt scarf to match her winter coat.
The cobalt water of the lake looked almost unreal against the grey cliffs.
Yuki decorated the nursery with cobalt curtains and a soft white rug.
文法句型
cobalt + noun
用法筆記
Used only before a noun (attributive position). Cannot be used after a linking verb: say the cobalt door, not the door is cobalt.