2 Inconspicuous Bottle

指导老师：乐永康

Put a lit candle behind a bottle. If you blow on the bottle from the opposite side, the candle may go out, as if the bottle was not there at all. Explain the phenomenon.

兰清渠

1. 怎么定义 a lit candle？
2. 这个课题，似乎实验容易做，理论上，如何着手？
3. behind需要有哪些限定？