barometer
n. 气压计，晴雨表；变化的标志，指标
复数 barometers
例句
A man in camp took a barometer reading at half-hour intervals.
营地里的一个人每半小时看一次气压计。
《柯林斯英汉双解大词典》
In past presidential elections, Missouri has been a barometer of the rest of the country.
在过去的总统大选中，密苏里州一直是该国其余各州的晴雨表。
Infant mortality is a reliable barometer of socio-economic conditions.
婴儿死亡率是社会经济状况的可靠指标。
《牛津词典》
