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1. fertility rate 生育率
例句："The fertility rate will naturally go down with a better economy and a greater passion for education," Liang said.
“经济状况好转，热衷教育，生育率会自然下降，”梁中堂说。
2.time bomb 定时炸弹
例句：It is a ticking time bomb for the federal budget.
对于联邦预算而言，过高的医疗费用就像一枚定时炸弹。
