这是原句
VeriSign Interactive Application Services are enabling companies to reach new audiences and customers through innovative applications, helping them remain competitive in an always on environment.
參考答案:从此句来看，应该是in an environment，而always on应该是environment的定语。
句子可译为“VeriSign交互式应用服务”正通过创新的应用使公司能够接触到新的观众与顾客，并帮助这些公司在始终开放的环境中保持竞争力。“
因此个人认为always on environment可译为“始终开放的环境”，具体指什么应该要根据整篇文章来理解了
