日期变更线为东的经线都称为西经纬度,纬线(latitude)我们通常说的纬
wikimedia.org/wiki/file:latitude_and_longitude_of_the_earth.svg
addcircles(lat= sta_gb$latitude, lng = sta_gb$longitude
con(f.collapse('mean','longitude'), ylog=true)f=cf.
is it true that x-rays give us cancer in 20 years?
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