Colour Code: 

Green: Open to book 开放报课

Yellow: Limited space left, be quick，少量余位，从速

Red:    FULLY booked, waiting list only，已满，接受排队待位

Tip: Try the search function to find more, e.g. "reading".(PC only). 可以使用搜索功能快速定位，例如："导读"。(仅PC端可用)。