回链指针指向前一个堆栈框架的回链指针。
The back chain pointer points to the back chain pointer of the previous stack frame.
不过，XPDL不限制流拥有指向前一活动的链接。
However, XPDL does not restrict flows from having links to predecessor activities.
这种鸡的独特头冠指向前方，好似阿彭策尔地区女士穿戴的传统服饰中的软帽。
The unique crest points forward like the bonnets on the traditional costume bonnets worn by the ladies in the Appenzellerland region.
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