volatile - constant 易变的
Volatile rate constant 挥发速率常数
volatile constant
不稳定常数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In a volatile sport, Paterno was an anachronistic constant, prowling the sideline in his trademark thick glasses and rolled pant legs.
WSJ: Jason Gay: Joe Paterno's Unsettled Goodbye
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