even if 与 even though 这两个词组大致意思相当,但强调的侧重有所不同.

even though即使, 纵然（侧重引出的是事实）

Even though I should fail ten times, I wouldn’t lose courage. 即使要失败十次，我也绝不灰心。

even if 即使（侧重引出的是把握不大或假设的事情）

Even if we achieve great success in our work,we should not be proud.

即使我们在工作中取得了巨大成绩,也不应该自满.

比较

Even though he knows it, he'll not let out the secret.（他知道这个秘密）.

Even if he knows it, he'll not let out the secret. （不确定他是否知道这个秘密）.