Be friendly, but not overly casual or familiar.

要友善，但不要过度随便或套近乎。

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SAs are usually built by casual programmers using short, iterative development life cycles that often are measured in days or weeks, not months or years.

情景应用程序通常由临时程序员使用较短的迭代开发生命周期构建，该生命周期通常用天或周度量，而不是用月或年度量。

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HIV infection is not spread by casual contact such as hugging, by touching items previously touched by a person infected with the virus, during participation in sports, or by mosquitoes.

一些日常接触不会感染HIV，例如拥抱，触摸被感染者接触过的物品，共用体育器械或者蚊虫叮咬。

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The reason why possession of small quantities of cocaine or ecstasy is not treated as a serious offence is because, like it or not, the casual use of these drugs is now as common as use of cannabis became in the 1970s.

ECONOMIST: Daft about drugs

While the city has almost every kind of eatery imaginable, and is arguably the best food city in the nation right now, especially for fine dining, it did not have a lobster roll joint or casual to-go seafood place that was not sushi.

FORBES: Lobster Roll Craze Reaches Las Vegas

If spaces designated for casual interaction are visually isolated or not along natural circulation patterns then it is difficult to casually use them.

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