你可改变这些粒子向下移动的速度，或增加粒子数量。
You could change the speed that these balls move down, or you could increase the number of balls.
在阅读时，一些学生喜欢用手指着课文向下移动，这实际上降低了其阅读速度。
Some students tend to lead their fingers down the text, which in actual fact slows down their reading speed.
在阅读时，一些学生喜欢用手指着课文向下移动，这实际上降低了其阅读速度。
Some students tend to lead their fingers down the text, which in actual fact slows down their reading speed.
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