排序2D numpy数组

Question

我想按浮点数（第一列）的升序获取以下numpy数组第二列中存在的字符串列表

array([[0.03437506344670402, 'spore-print-color_r'],
      [0.013735367266175896, 'stalk-surface-below-ring_y'],
      [0.08658915843078754, 'stalk-root_r'],
      [0.6251435175471661, 'odor_n']])

输出应为

['odor_n', 'stalk-root_r', 'spore-print-color_r', 'stalk-surface-below-ring_y']

我该如何实现？