[] used to describe technology, a product, etc. that has been developed and improved since it first appeared（技术、产品等）第二代的，改进型的◆Second-generation e-learning no longer just provides information, but instead forces the student to make choices and decisions.第二代网络教学系统已经不再是仅仅提供信息，而是迫使学生作出选择和决定。 ( 2G) used to describe mobile telephone networks without wires that were the first to use digital technology第二代的（指首次使用数字技术的第二代移动通讯网络）◆second-generation cellphones第二代手机