释义
n.
〈主北美〉 复试。
a telephone call made to return one that someone has received
回电话。
[mass noun]a security feature used by some computer systems accessed by telephone, in which a user must log on from a previously registered phone number, to which the system then places a return call
回叫（某些通过电话访问的计算机系统的安全设置，用户必须用预先注册的电话号码登录，然后系统再回电话接通）。
