选择性自动对焦和变焦 Selective Auto-Focus & Zoom
使用F2.8-F4左右的光圈，并且选择性的对焦，将您想要强调的部分放在焦点上。
Using an aperture of 2.8 or 4 will allow you to use selective focus, putting more emphasis where you choose.
这对于动机策略的选择性采纳提供了一个基础，从而判断动机强化的相对焦点与学习者的特征是否相匹配。
This provides a basis for the selective adoption of motivational strategies, where relative emphasis of motivational enhancement is judged to match learners' profile.
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