合成一句更複雜嘅句子 哩個詞"foil"最初係用於高中生學習代數嘅記憶法
當然,呢個句子嘅複雜版本係 "The word ''FOIL' was originally intended solely as a mnemonic for high-school students learning algebra, but many students and educators in the United States now use the word ''foil' as a verb meaning'to expand the product of two binomials'". 美國好多學生同老師都用 foil 嚟代替動詞,