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重点讲解：
1.During this presentation 在这期间;在这里
例句：During this presentation, I realized the wisdom of the ancients, papermaking is one of the crystallization of their labor;
在这段介绍中，我体会到了古人的智慧，造纸术也是他们的劳动结晶之一
2.impact on 影响；对…冲击
例句：He said the right stimulus plan would "not be window-dressing" and would have a "measureable" impact on growth.
他表示，适当的激励计划“不是一种形式”，将对经济增长产生“重大”影响。
3.a boom in 暴涨...
例句：Russia has become rich over the last few years due to a boom in commodity and energy prices.
由于商品和能源价格暴涨，俄罗斯在过去的数年里已经变得富有。
4.at the forefront 最前沿
例句：They may look like an ordinary pair of spectacles, but these glasses are at the forefront of a revolution in eyewear.
它们看起来像普通的眼镜，但是是眼镜改革的最前沿。
