OUR WORLD
Teens 点金
高考词汇
signal n. 信号，征象
The change in his behavior is clearly a signal that there is a problem.
digital adj. 数字的，数位的
Imagine what would happen if all the digital technology in the world stopped working.
- 对本期电子报订户、有效期内的VIP教师会员和本学期高三尊享卡用户，我们开放所有内容：
- 如果您拥有以上权限，请点这里登录；
- 订阅电子报，请点这里；
- 激活VIP教师卡，请点这里；
- 激活21英语尊享卡，请点这里。
