rusty spot的用法和樣例：
例句
- When he tried it the rusty metal did not budge, and he came away with red flecks covering his fingers.
他試了一試，這生鏽的金屬板一動也不動，他走到一旁，手指上滿上剝落的紅色的銹斑。 - Marble is a kind of natural material, have a lot of natural grain, form all sorts of different crackle that send form and tiny flaw or rusty spot in the surface.
大理石是一種天然材料，具有許多天然紋理，並在表面形成各種不同的髮狀裂紋和細小瑕疵或銹斑。
