Accidents are not frequent, but happen every few years.

相关事故虽然算不上频发，但是每几年就会发生一次。

youdao

Turtles would not have been affected by the Exxon Valdez simply because they do not frequent the coasts of Alaska.

海龟没有受到Exxon Valdez漏油事件影响仅仅因为它们并不常出现在阿拉斯加沿海。

youdao

According to the theory of design of pure filter machine has the same performance, not easy jam, not frequent irrigation, cause the work to cycle greatly extended.

按此理论设计的精滤机具有同样效能，不易堵塞，不会频繁冲洗，使工作周期大大延长。

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The Copenhagen meeting drew about , 2,000 scientists from around the world, and the news they delivered was not encouraging as they warned of an increasingly warmer world with more frequent droughts, and food and health problems.

VOA: standard.2009.03.12

Now, the reason to be interested in them, again, is not because they're frequent.

对这些障碍非常关注的原因,并不是它们很常见

耶鲁公开课 - 心理学导论课程节选

These are not frequent flyer miles. (Laughter.) She does not get discounts.

WHITEHOUSE: Remarks by the President at the Diplomatic Corps Reception

Under cross-examination Ms Willis said the violence towards her was not frequent and Mr Philpott was never violent towards the children.

BBC: Child fire deaths: Michael Philpott 'hit mistress'

Killer whales might be able to eat them, Watanabe suspects, but Greenland sharks usually stay within deep water that killer whales do not frequent.

MSN: Presenting the world's slowest shark - Technology & science - Science - DiscoveryNews.com | NBC News