The first and most intuitive use for an arrow function would be as an anonymous callback.
首先介绍箭头函数最直观的用法，即用作匿名回调函数。
If required, use the arrow icon on the function to select something other than the default.
如果需要，可以使用该功能上的箭头图标选择除缺省功能以外的其他功能。
The diagram of distribution of speed arrow, constant lines of flow-stream function, vortex, two speed parts and pressure were studied.
绘制了速度矢量分布图，和流函数，涡量，两个分速度及压强的等值线分布图。
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