理解描述性和解释性标题的不同。
Learn the difference between descriptive and explanatory titles. Descriptive titles merely state what's on the screen " 2010 Dept."
解释性标题则是引子—快速地总结片子的信息(例如，“2010年成本未超预算”)。
Explanatory titles are primers - quick summaries of the information on the slide (e.g. "Project costs for 2010 are well within budget").
副标题，小标题：次要的，通常是解释性的标题，如文学作品中。
A secondary, usually explanatory title, as of a literary work.
副标题，小标题：次要的，通常是解释性的标题，如文学作品中。
A secondary, usually explanatory title, as of a literary work.
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