A frequent change of role is the training requisite for a mastery of the actor's art.

频繁地转换角色是掌握表演技能的必要训练。

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The best way to change a life of frustration into a life of mastery is by developing talents and strengths, not just shoring up weaknesses.

NPR: Excerpt: 'Delivered from Distraction'

It was a rare example in politics of clarity of purpose combining with mastery of detail, and resulted in a change that could aptly, and unusually, be called historic.

ECONOMIST: Edward Heath