邻居们警告我们要当心栅栏后面那只凶恶的狗。
Neighbors warned us about the ___vicious dog behind the fence.
检察官将这名嫌疑人描述为一个凶残的罪犯。
The prosecutor described the suspect as a ___vicious criminal.
缺乏教育造成了贫困的恶性循环。
The lack of education creates ___a ___vicious ___circle of poverty.
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