V-I If water roils, it is rough and disturbed. 激荡; 翻腾 [美国英语]
The water roiled to his left as he climbed carefully at the edge of the waterfall.
当他在瀑布边缘小心攀爬时,水飞溅到他左边。
V-T Something that roils a state or situation makes it disturbed and confused. 扰乱; 使混乱
Times of national turmoil generally roil a country's financial markets.
国家动荡不安的时候,通常引起金融市场混乱。
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