We have three options left — I, E, B, we've already used F.

我们还有三个选项——I、E、B，我们已经用过F了。

In nineteen fifty, W. E. B. Du Bois became an official of the Peace Information Center.

1950年，W.E.B.杜博斯成为和平信息中心的官员。

In nineteen thirty-four, W. E. B. Du Bois resigned from his position at The Crisis magazine. It was during the severe economic depression in the United States.

1934年，W.E.B.杜博斯从《The Crisis》杂志辞职。那时正好是美国经济萧条期。