要控制字体的大小和粗细，编辑 ...
请注意下面这个片子如何使用相对“乏味”的字体，但通过不同大小和粗细的运用，并添加一些可视化的趣味，最终创造出的东西那是相当的不沉闷。
Notice how the slide below USES relatively "boring" fonts but varies the size and weight to add visual interest and create something that is ultimately quite non-boring.
作用力、泵血量和动脉粗细、弹性决定压力大小。
The pressure is determined by the force and amount of blood pumped, and the size and flexibility of the arteries.
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