They serve the purpose of changing hydrogen into breathable oxygen.它们的目的是为了把二氧化碳转化为可供呼吸的氧气.And they're as necessary here as the air is, on Earth.它们在这里的重要性如同地球上的空气一般。But I still say, they're flowers.但我想说的是,它们是花,仅此而已。If you like...随你怎么想吧。Do you sell them?你卖这些花吗?I'm afraid not.我想我恐怕不卖它们。But, maybe we could make a deal.但也许,我们可以做个交易。