问题描述：
这段话最后一句中的两个BY是什么意思?
Protests in Hong Kong ahead of an election on Sunday are posing a major test for the city's new leader as voter discontent fuelled by anger over perceived meddling by Beijing threatens to shake up the political landscape.
就是这部分：“discontent fuelled by anger over perceived meddling by Beijing threatens to shake up the political landscape“
by anger over perceived meddling by.
Protests in Hong Kong ahead of an election on Sunday are posing a major test for the city's new leader as voter discontent fuelled by anger over perceived meddling by Beijing threatens to shake up the political landscape.
就是这部分：“discontent fuelled by anger over perceived meddling by Beijing threatens to shake up the political landscape“
by anger over perceived meddling by.
问题解答：
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