虽然相貌非常相像
Although they look very similar
以上为机器翻译结果，长、整句建议使用 人工翻译 。
一人有两个儿子，是双胞胎，虽然相貌非常相像，但有一点却截然不同：一个是乐观主义者，另一个是悲观主义者。
A man had two sons. They were twins. They looked exactly alike, but in one important way they were very different: one was an optimist, while the other one was a pessimist.
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