Vocal learning is a long and strenuous process, and the exercise of volitionalcontrol allows vocal learner to have stronger motivation.
声乐学习是一个长期而艰苦的过程，意志调控的参与使声乐学习者具备了更强的主观能动性。
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This article defines the self -regulated learning habit and describes the process of self -regulation as cyclical phases:forethought, performance or volitionalcontrol, and self -reflection.