評論
打印
Listen again to part of the lecture, then answer the question.
再聽一遍這個(gè)演講中的一小節(jié)，然后回答問題。
What do you need to do to that water besides put fertilizer in it?
除了在水里加入肥料還要對水做些什么？
Anyone ever actually tried to grow plants in water?
有人試過在水里種植物嗎？
You must bubble water through it. Bubble gas through it. I'm sorry, you must bubble gas through it.
你得往里面充入水。充入氣體。
So, gas, you have to bubble through.
說錯(cuò)了，是充入氣體。所以你得往里面充氣。
Why does the professor say this:
教授為什么說：
I'm sorry, you must bubble gas through it.
說錯(cuò)了，是充入氣體。
