id	keyword
assc-35896	land
assc-35896	farmland
assc-35896	protection
assc-35896	ecological
assc-35896	pollution
assc-35896	system
assc-35896	control
assc-35896	security
assc-35896	china
assc-35896	farmland protection
assc-35896	food
assc-35896	development
assc-35896	fallow
assc-35896	law