hair
In German, the word 'Haar' is used to refer to a single strand of hair or multiple strands collectively. It is a neuter noun, so when referring to one strand of hair, the article 'das' is used. For example, 'Das Haar ist lang' means 'The hair is long'. When referring to multiple strands, the plural form 'Haare' is used. For example, 'Meine Haare sind dunkel' means 'My hair is dark'.
My hair is very long.
This sentence is pretty straightforward. 'Mein' is possessive pronoun for 'my', 'Haar' is the noun for 'hair', 'ist' is the verb 'is' and 'sehr lang' means 'very long'.
I found a hair in my soup.
In this example, 'Ich' is the pronoun for 'I', 'habe' means 'have', 'ein' is 'a', 'Haar' translates to 'hair', 'in' is 'in', 'meiner' is 'my' and 'Suppe' is 'soup'. 'Gefunden' is a past participle meaning 'found'.
The dog hair is everywhere.
In this example, 'Das' is the article 'The', 'Hundehaar' is a compound noun formed from 'Hunde' meaning 'dog' and 'Haar' meaning 'hair'. 'Ist' is 'is', and 'überall' translates to 'everywhere'.