Work hours are often irregular, and the work can be dangerous.

工作时间通常是没有规律，工作是很危险的。

youdao

Relations are flat, highly structured, strongly typed, and unordered while XML data is ordered, nested, hierarchical, optionally typed and often irregular and semi-structured.

关系型数据是平面的、高度结构化、强类型化、无序的，而XML数据是有序、嵌套的、层次化的、可选类型化的，并且往往不规则且是不完全结构化的。

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Unlike the sinusoidal, endlessly repeating waves used in Fourier analysis, wavelets are often irregular and asymmetric, with values that die out to zero as they move farther from a central point.

与傅里叶分析中使用的无限重复的正弦波不同，小波常常是不规则的和非对称的，随着离中心点越来越远，其数值逐渐靠近零。

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"What we are finding is that migrant workers, particularly irregular migrant workers, very often young women, around the world are at tremendous risk of serious exploitation," .

VOA: standard.2009.08.21

There is a law where the umpires often, and at irregular intervals, check the ball and they saw nothing wrong with it.

BBC: Ball-tampering row angers Strauss despite draw