求翻译：这是最新的手册出口数量,请注意:第三本和第四本手册的SD出口数量更改了,因为PTA的进口数量只能生产这个数量的SD产成品,请在计划出口时注意这个可出口的数量.谢谢!是什么意思？

This number is up to date manual export, please note that the SD export quantity of the third and fourth manual changes, because the volume of imports of PTA production only the number of SD products, please note the number that can be exported in planning export. thank you!