While any residues detected have been rare, and of low concentration, milk is of special concern because it is a staple of children \ 's diets.

由于它是作为儿童的主要饮食之一，所以当它被检测出有任何的残留量，即使是稀少的，低浓度的，它也是会受到特别的关注。

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just because in some rare instances it's misused.

我们不能仅仅因为这种实验方法在一些情况下被滥用就完全摒弃这种方法。

需要动物实验吗？ - SpeakingMax英语口语达人

Doctors often overlook the signs because it's so rare and symptoms can be as mild as headaches.

WSJ: Illnesses Fuel Scrutiny of Pharmacies

It must be held in high esteem, of course, because it's a relatively rare award.

BBC: 'Superb gallantry' of Sir Tasker

It's very rare that we would do that because we want the certainty that when someone is tried for a criminal offence and found not guilty then that is the finality of it.

BBC: NEWS | UK | England | Tees | Police to re-examine 1989 murder