第1个回答 2013-01-07
to increase independent study.来自：求助得到的回答
第1个回答 2013-01-07
Strengthens the independent learning金山词霸上的
第2个回答 2013-01-06
enhance study independently.
第3个回答 2013-01-06
improve the ability of self-study
第4个回答 2013-01-06
Increase time for self-learning