Disturbance degree of the apparent phase velocity increases with decrease of frequency until a maximum one occurs.

表观相速度扰动程度随频率减小而增加，直至出现大扰动。

youdao

Even worse, they don't learn from their mistakes, because if, God forbid, one occurs, it should be concealed like a nasty secret.

更糟糕的是，他们不从错误中吸取教训。 这是因为如果——上帝保佑——一个错误发生了，应该像隐瞒一个肮脏的秘密一样把它深深埋在心底。

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This ensures a smooth transition to the final state and also assures that a single failure, if one occurs, does not bring down the entire enterprise.

这可确保平稳过渡到最终状态，还能确保单个故障(如果出现了)并不会让整个企业陷入崩溃状态。

youdao

Sudden heart failure occurs in approximately one out of 100,000 students each year.

VOA: standard.2009.12.12

Well, that process occurs in a series of steps and one of those kinds of steps is shown here.

这个过程的发生包含一系列步骤,而这些步骤中的一个步骤即如图所示

耶鲁公开课 - 生物医学工程探索课程节选

I was talking last time about the concept of election or choice, God's choice of Israel, Israel as the chosen one, which occurs for the first time in the Book of Deuteronomy.

我上节课提到了“选择“这一概念，上帝选择了以色列，以色列成为选民，这一概念第一次出现在《申命记》中。

耶鲁公开课 - 旧约导论课程节选

The key is to limit potential problems and act quickly when one occurs to keep it from happening over and over again.

FORBES: Outsourcing Can Do Much More Than Just Cut Costs

Even if Britain remains more prone to inflation than America, there are good reasons why a recession, if one occurs, is likely to be milder than in the past.

ECONOMIST: On the brink of recession?

Just last month, researchers led by Armin Arbab-Zadeh of Johns Hopkins University School of Medicine in Baltimore published a comprehensive review of the biology of heart attacks in the journal Circulation, which said that vulnerable plaques often rupture without causing a heart attack and that a "perfect storm" of other conditions is required before one occurs.

WSJ: Predicting Who Will Have Heart Attacks