foundation
1.the foundation(s) of his career, the foundation(s) of her fortune等表达方式用单数形式或复数形式都可以。
2.lay the foundations of(建立…的基础)比lay the foundation of 普通,lay the foundation for比lay the foundations for普通。lay the foundations for最不普通。
3.foundation principles(基本原理),foundation vocabulary(基本词汇)等表达方式里的foundation用作形容词,是美国用法,在英国用fundamental。