When the reply came a few months later they were enrolled as full members, but Chu’s membership was kept a secret from outsiders. 译文：回信来了几个月之后，他们都被吸收为正式党员，但朱德的党籍对外界保密。

【参考答案】

过了几个月，回信来了，两人都被吸收为正式党员，但朱德的党籍对外界保密。