id	keyword
esrj-93925	precipitation
esrj-93925	period
esrj-93925	change
esrj-93925	figure
esrj-93925	oscillation
esrj-93925	time
esrj-93925	wavelet
esrj-93925	term
esrj-93925	years
esrj-93925	china
esrj-93925	harbin
esrj-93925	changchun
esrj-93925	50a
esrj-93925	precipitation change
esrj-93925	arid