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.
“經濟狀況好轉,熱衷教育,生育率會自然下降,”梁中堂說 。
2.time bomb 定時炸彈
例句:It is a ticking time bomb for the federal budget.
對于聯邦預算而言,過高的醫療費用就像一枚定時炸彈 。