[kāi kěn]
open up wasteland for farming; reclaim wasteland; bring under cultivation; break ground; cultivate; reclamation
									
										They opened up large tracts of wasteland.
										他们开垦了大片荒地。
									
									
									
										We plan to bring all these mountain slopes under cultivation.
										我们计划把所有的山坡都开垦出来。