威廉姆斯博士认为她知道原因：太空植物渴望空气。

Dr. Williams thought she knew why: the space plants were hungry for air.

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威廉姆斯博士说：“对于长期太空旅行来说，这是好消息。”

"And this," says Dr.Williams, "is good news for long-term space travel."

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威廉姆斯博士尝试了一种带有风扇以保持空气流动的新温室。

Dr. Williams tried a new greenhouse that had a fan to keep the air move.

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