满足条件以及行上所有子序列值时屏蔽（不使用循环）
x = pd.DataFrame([[10, 20, 30, 11, 9], [13, 16, 21, 10, 9], [11, 5, 23, 50, 0]])
我想一个面具，显示如果任何一行有一个值大于20。如果为True，则该行上的所有后续值也应为True。
e、 g第一行应改为：
False, False, True, True, True
我不知道不使用循环怎么做。
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