A proper spine board or rescue stretcher is far more suitable, but not often available.

合适的脊椎板或急救担架更为合适，但并不经常使用。

youdao

But not often.

但也不常常如此。

youdao

Sometimes there are exceptions to this rule, but not often.

有时候，这个规则有一些例外情况，但是不常见。

youdao

But Dr.Brown says fingertips are not often reattached if they are the length of a fingernail or shorter.

VOA: special.2011.02.02

They're not all found in every treaty, but they're often enough found that we can speak of these six elements.

它们并不是每个条约都能找到,但是提及六个部分，它们都能被找到。

耶鲁公开课 - 旧约导论课程节选

They often involve networks of reactions, not just one enzyme but a series of enzymes that serve to amplify each other.

这些反应通常包括一个反应网络,不只是一种酶,而是一系列的酶来进行级联放大

耶鲁公开课 - 生物医学工程探索课程节选

This is something advised by major providers of wi-fi but not often set up by the user.

BBC: You could get online across London with the new plans.

They eat in restaurants, but not often at Applebee's, Denny's or Waffle House, chains that cater to the common taste.

ECONOMIST: Lexington

Sure, once in a while a fair flipped coin will give you ten heads in a row, but not often enough to worry about.

FORBES: Christmas, Kurtosis, Fat Tails, Black Swans And Risk Management, Pt. 2