It has features as follows: identity authentication, changeable communicationkey, secure against active and passive attack.
该方案具有：身份认证、可变密钥、抗主动和被动攻击的优点。
2
Good communication is key to our success.
良好的沟通是我们成功的关键。
《牛津词典》
3
Silent onstage communication is key, and each pianist has their own style of "nodding" to indicate a page turn which they need to practise with their page turner.