Mary had feared the day she would draw a blank during a presentation.

玛丽担心自己在演讲时头脑短路了。

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And blank the screen and step forward whilst talking... Often, it takes time for them especially for the presentation beginners to really adopt the above.

黑屏，并且讲话时往前一步……当然，通常情况下尤其对于刚开始演讲的人来说，要掌握以上的方法需要一点时间。

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Socio-biologist Rebecca Costa followed McDonough, and while her presentation style struck this viewer as well over the top, she made the essential point that far from blank slates, we as individuals are the certain genetic result our ancestors.

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