实际上，培育百日菊属植物开花对空间站宇航员Scott Kelly来说极富挑战。

Indeed, getting the zinnia flowers to bloom proved challenging for ISS astronaut Scott Kelly.

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百日菊原产美洲热带地区的一种百日菊属植物，尤其是菊科，因其有各种颜色的、艳丽的舌。

Any of various plants of the genus Zinnia, native to tropical America, especially Z. elegans, widely cultivated for its showy, rayed, variously colored flower heads.

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