You'll use these arrows later in "tracing back" to construct an actual LCS (as opposed to just discovering the length of one).

后面的“回溯”一节将用这些箭头建立实际的LCS(与仅仅发现LCS长度相反)。

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When something goes wrong, tracing back through the flow to determine when and where a failure occurred is complex and time-consuming.

当某个地方出错时，在流中追溯以确定何时及何处发生错误将非常复杂和耗时。

youdao

After tracing back through the list of referrers, I found that the root node was a static hashtable that stored the fonts in use for each form.

通过逆向追踪引用者列表，我发现根节点是用来存储每个窗体所用字体的一个静态hashtable。

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And tracing back where it came from can be really hard.

然后去查找问题来源,可能会很困难。

麻省理工公开课 - 计算机科学及编程导论课程节选

San Francisco has a long history as a chocolate city tracing back to Ghirardelli, which was founded here more than 160 years ago.

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Djokovic puts an unusual slant on the reasons for the success of the current crop of Serbian players, tracing it back to the crisis of 1999 when NATO planes bombed Belgrade before the regime of president Slobodan Milosevic was removed.

CNN: Djokovic leads Serbian tennis revolution

Neame is of old Murchison stock, tracing her family back to when the area was settled in the 1800s, and knows plenty of local history.

BBC: New Zealand��s never-ending fire