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请问x方向的速度在y方向的导数（du除以dy），在用场函数的形式该怎么写呢（不太了解star里面的语言表达，在帮助文档里没找到这种形式的场函数）
曲线救国：建一个矢量场函数grad($$Velocity[0])，再去用这玩意儿的第2个分量..
grad($$Velocity[0])
