id	keyword
fbem-8332	trade
fbem-8332	industrial
fbem-8332	trade openness
fbem-8332	environmental
fbem-8332	pollution
fbem-8332	level
fbem-8332	emissions
fbem-8332	model
fbem-8332	openness level
fbem-8332	effect
fbem-8332	relationship
fbem-8332	wastewater
fbem-8332	coefficient
fbem-8332	test