This ruler is blue.

This ruler is blue. Blu reads French and English [blu? ], beautiful [blu? ]

Blue; Melancholy, depression; < English, informal > conservative, conservative; (jokes, stories, etc. ) yellow and pornography; Blue (due to cold or difficulty breathing), blue

Sky blue, blue; Sky, sea; & lt English > The player of the school team (Cambridge or Oxford University) has blue honor; & ltAnz > red hair; & ltAnz > mistakes, mistakes; & ltAnz > arguing and beating; Rare steak

Turn blue; < History > Wash (white clothes) with blue bleach.

phrase

1, cobalt blue Cobalt blue; brilliant blue

2. Blue Moon Blue Moon

3. Dark blue? dark blue

Usage: 1 When blue is used as a noun, it means "blue", that is, the color is the same as that of clear sky or ocean. Blue is often used as an uncountable noun and can also be used as a countable noun, especially when it represents some form of blue.

2. Blue can be used as subject or object in sentences. Before blue, it is customary to add the article The, which means "blue sky" and "sea".

3. The plural form of blue can mean "emotional sadness" and so on. It is often used with the definite article The, which means "melancholy" in blues.