Description:
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in manual/en/function.ps-translate.php
function ps_translate — Sets translation

in first box under "Examples" after example,
The above example demonstrates two possible ways to place a graphic (in this case just a rectangle) at any position on the page, while the graphic itself uses its own coordinate system. The trick is to change the origin of the current coordinate system before drawing the rectangle. The translation has to BE undone after the graphic has been drawn. 

Add the word "be" before "undone".

Many thanks in advance. PHP documentation is the best in the universe!
-bob