提示：点击例句中的单词，就可以看到词义解释

Worry stays fairly steady until 50 , then sharply drops off .

忧虑感在50岁之前保持相当稳定，然后急剧降低。

Crucially , fertility tends to fall only as poverty drops .

关键问题是，只有在减少贫困的同时，出生率才会趋于下降。

As the cost of sensors drops , creating an internet of things becomes more attainable .

由于传感器的价格降低，物联网的建立变得更加可实现了。

Spending on care skyrockets while funding for screening , prevention and research drops .

用在治疗上的花销高涨而为检查，预防和研究的经费却减少了。

If the number of workers drops , output per worker has to rise to maintain the same level of production .

如果工人数量减少，为了保持产量的原有水平就必须增加每名工人的输出量。