envelope response factor 反应系数
envelope of load factor 过载包线
envelope factor
信封的因素
以上为机器翻译结果，长、整句建议使用 人工翻译 。
After extensive research, the fire service decided that condoms - rather than pens, rulers, etc - packaged in a cardboard envelope bearing the core message, had the best novelty factor and the ability to communicate a wider safety message.
BBC: Fire service condoms for students
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