从刚才这三个简单的例子，您可以看到gnuplot能够理解pi并具有丰富的自带数学函数词汇表。
From just these three simple examples, you can see that gnuplot understands PI and has a rich and natural vocabulary of mathematical functions.
MathML是表示数学信息的W3C xml词汇表。
MathML is the W3C's XML vocabulary for representing mathematical information.
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