feldspar bed

例句：

1. 1. The feldspar bed is a layer of sedimentary rock that has been formed by the action of magma.
   岩浆岩床是一层沉积岩，是由岩浆作用形成的。
2. 2.The feldspar bed is an important source of minerals for many industries.
   岩浆岩床是许多工业的重要矿物来源。
3. 3.The feldspar bed is a unique geological feature that can be found in many different environments.
   岩浆岩床是一种独特的地质特征，可以在许多不同的环境中发现。