Big and small of residual error and rule of sign change was observed with inspection method of residual error, and if it had system error or rough error and so on was identified.

采用残余误差观察法观察残差图中各个残余误差大小和符号变化规律，可直接判断有无系统误差。

youdao

If the listener is not paying attention, it's your sign to shorten the story or change direction.

如果听者不专心，这表明你应该缩短故事或改变话题。

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And, if it is a signed multiply, the sign could even change on truncation!

而且，如果进行的是有符号乘法，符号还有可能会由于截断而改变！

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Ayatollah Ali Khamenei said in an address Saturday despite the new administration's slogan of change, there has been no sign of genuine change in what he termed hostile U.S.policies toward Iran.

VOA: standard.2009.03.23

The Indian leader announced Monday that the United States and India would sign a memorandum of understanding during his visit designed to improve cooperation on energy security, clean energy and climate change.

VOA: standard.2009.11.25

One clear sign of change is the bank's newfound enthusiasm for lending to small businesses.

ECONOMIST: European Bank for Reconstruction and Development

So the upheaval now may be a sign that change is afoot.

ECONOMIST: The Tour de France is not dead yet

Another potent sign of change is that a motion to buy more time to think about gay ministers without any commitment to change was narrowly defeated.

BBC: Mood shift points to gay clergy for the Kirk