speck       
noun [ C ] uk/spek/ us/spek/
 小点,斑点;小片;一点点
a very small mark, piece, or amount
  He'd been painting the door and there were specks of paint all over the floor. 他在给门上漆,弄得地板上到处都是油漆斑点。 
 There's not a speck of (= not any) dust/dirt in their house. 他们的房子里一尘不染。 
 We could see a speck (= a small amount) of light at the end of the tunnel. 我们可以看见隧道尽头有一点亮光。 
 Synonyms: mote particle (SMALL PIECE)
Compare: shardfragment noun