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2 changes: 1 addition & 1 deletion docs/chapter4/alignment.md
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Expand Up @@ -105,7 +105,7 @@ Alignment(this.x, this.y)
`FractionalOffset` 继承自 `Alignment `，它和 `Alignment `唯一的区别就是坐标原点不同！`FractionalOffset` 的坐标原点为矩形的左侧顶点，这和布局系统的一致，所以理解起来会比较容易。`FractionalOffset`的坐标转换公式为：

```
实际偏移 = (FractionalOffse.x * childWidth, FractionalOffse.y * childHeight)
实际偏移 = (FractionalOffset.x * childWidth, FractionalOffset.y * childHeight)
```

下面看一个例子：
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