中国还在经纬仪附近发射了气象气球来测量大气温度和压力变化，以更好地估计折射误差。
The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors.
正确、规范地使用经纬仪跟踪气球测风是提高测风质量的关键。
The key of the wind observation quality is that using the theodolite right ly and normally to follow the wind observation balloon.
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