theory of key stratum的用法和樣例：
例句
- A deformable layer theory does not appear to be tenable in glass-reinforced composites.
變形層理論在玻璃增強復合材料中說(shuō)服力不強。 - The distributions of the field variations are given.The new friction layer theory is applied and nonsteady and steady deformation are studied.
應用新的摩擦層理論，研究了非穩態(tài)和穩態(tài)變形，實(shí)現了工件成形過(guò)程的計算機動(dòng)態(tài)圖形顯示。
