新增由键盘快捷键保存图像默认质量的功能。
Added ability to save image with default quality by keyboard shortcut.
不过，音频的质量则要低于默认值。
The audio quality, however, appears to be lower than the default values.
地面是一个静止的立方体，这是Box2D已知的，因为这个立方体的质量为零(默认)，因此不会与其他物体相撞。
The ground is a box that is static, which Box2D knows, because the box has zero mass (by default) and therefore doesn't collide with other objects.
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