id	keyword
bcpe-4699	education
bcpe-4699	nature
bcpe-4699	children
bcpe-4699	nature education
bcpe-4699	development
bcpe-4699	research
bcpe-4699	china
bcpe-4699	practice
bcpe-4699	psychology
bcpe-4699	environment
bcpe-4699	problems
bcpe-4699	students
bcpe-4699	experience