皮质醇会扰乱数学焦虑，但对于不紧张的人来说，皮质醇的突然升高反而会产生相反的作用，研究显示：皮质醇升高会让一个人进入“绩效甜蜜点”。
A sudden boost of cortisol that flummoxes the math-anxious has the opposite effect on the non-anxious, research shows: It pushes the person into the "performance sweet spot."
产生的虚拟乱数介于0到1之间(包括0但不包括1)。也就是说，传回的数字可以是零，但是一律小于一。
The pseudorandom number generated is from 0 (inclusive) to 1 (exclusive), that is, the returned number can be zero, but it will always be less than one.
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