回复：新人求助帖，万分感谢

我父母今年6月份跟国内旅游团来美旅游时办理了旅游签证，是跟团一起去签证的，现在签证还在有效期内（一年有效），Visa type：R B1/B2，entries：M，急问妈妈可以凭此签证单独来美探亲吗？入关会有什么问题吗？万分感谢。
-I do not think your parents have any problem to enter U.S. using this valid visa again.
有网友提醒有消签问题，想请教有高人知道消签在签证上有什么记号，怎么样知道签证有没有被消签？
-If the visa was cancelled, it should be indicated in the visa stamp page in the passport. If you do not find any thing there, the visa is supposed to be valid.