The spice cinnamon and the drugs cascara and quinine (all come) from bark, the protctive (out) layer of (stems and roots) of woody (plants). all come錯在哪里啊?還有out和outer有什么區別?

熱心網友

all come沒錯，out用法錯誤。out是介詞，不能用來修飾名詞layer,應該用outer（形容詞）來修飾。