As we traverse the tree, changes are local to the current focal node, meaning all constant-time operations except for up.

遍历树时，更改是在当前关注节点的本地做出的，也就是说除了向上移动之外，所有操作都是常量时间的。

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At the same time, a level of global standardization is required for the network of national IHR focal points to operate effectively.

同时，为了能有效地运转，国际卫生条例国家归口单位网络需要建立一定的全球规范。

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This can be a tedious process because the first time you create the plane, you have to rotate the camera and change the focal length at the same time to get a good match.

这个过程可能很乏味，因为你要先建立平面，还不得不去旋转摄像机，并调节焦距以得到好的匹配效果。

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While Mirren's Phedre is a focal point, significant stage time is given to her scheming nurse Oenone (an impressive Margaret Tyzack) and to Hippolytus and his counsellor Theramene (John Shrapnell).

BBC: Review: Helen Mirren in Phedre

Time was, he notes, when Vienna was the focal point for the countries of Central Europe.

ECONOMIST: Wolfgang Sch��ssel, an Austrian abroad

And by the time Ronaldo left, Ferguson had turned Wayne Rooney into the focal point of the side.

WSJ: Manchester United Manager Ferguson Retires