source index meaning in English

资料索引

Starting at the specified source index and pastes them to another
中的一系列元素，将它们粘贴到另一
This method takes the source index , an array of characters , the destination index , and the number of characters to copy
此方法带有四个参数，即源索引、字符数组、目标索引和要复制的字符数。
This results in the vertex buffer you created earlier being bound to source index 0 , so any vertex element which is pulling its data from source index 0 will retrieve data from this buffer
上面代码的执行结果就是把之前建造的顶点缓存榜定到更早之前创建的资源索引0上面，继而这里所有的顶点元素都可以通过资源索引0来得到他们在缓存中的数据。