early period study的用法和樣例：
例句
- Edgeworth's early study of optimal income taxes indicated that after-tax incomes should be equal.
埃斯沃琪對最適所得稅的早期研究指出，稅後收入應當相等。 - An earlier study suggested that this program was successful in raising folate leels in women who might become pregnant.
一項早期研究顯示這項計劃在提高可能懷孕的婦女的葉酸水平方面是成功的。
