气压计的读数开始下降。
气压计的水银柱在下降，看来天气一定要发生变化了。
The glass is going down, so we must expect a change in the weather.
营地里的一个人每半小时看一次气压计。
A man in camp took a barometer reading at half-hour intervals.
气压计是丈量气压的好仪器。
The barometer is a good instrument for measuring air pressure.
气压计是测量气压的好仪器。
Thee barometer is a good instrument for measuring air pressure.
气压计是测量气压的好仪器。
Thee barometer is a good instrument for measuring air pressure.
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