... not to drive in no-driving days (red days)
[8] RadSensor
A simple Geiger-Müller counter based on camera lens of Android smartphone
[9] Learn French in 10 Days [法语十日入门]
An introductory French course for Chinese autodidacts
[10 Learn Portuguese in 10 Days [葡语十日入门]
An introductory Portuguese course for Chinese autodidacts
www.italian.org.cn/app/
www.zhangyichi.com