key materials的用法和樣例：
例句
- Melamine phosphate is the key material to guarantee the comprehensive performances for insulting layer.
三聚氰胺磷酸鹽是保障絕熱層綜合性能的關鍵材料。 - Power battery is the key link in electric auto industry, and hydrogen alloy is the key material impacting the performance of Ni-MH battery.
動力電池是電動車產業鏈的關鍵環節，貯氫合金又是決定鎳氫電池性能的關鍵材料。
