Once you can play a single clear note, then you will improve rapidly.

坚持练习吧，一旦你能准确地吹出单音符，以后的进步将是神速的。

youdao

It became very clear that the incident was not just an aberration; it was not just a single incident.

已经很明确这次事件并不仅仅是一次失常，也不只是一个单独的事件。

《柯林斯英汉双解大词典》

But there may not be a single or clear answer to who exactly the Aruba School prisoners are.

然而，或许没有单一的或明确的答案可以确认阿鲁巴学校中的这批囚犯的身份。

youdao

Paul Bunyan could clear large wooded areas with a single stroke of his large, sharp axe.

VOA: special.2009.01.24

No single group is expected to win a clear majority.

VOA: special.2010.03.13

It was not tightly framed or focused on a single concept, nor was there a single clear phrase that summed up the speech, at least at first listen.

CNN: Obama's ringing defense of liberalism

Above all, Mr Hague has made the mistake this week of pinning his own stature as party leader on his ability to impose a single clear Euro-policy on the Conservative Party.

ECONOMIST: Roll up that map of Europe

The British-born athlete, now competing for Italy, was just a single centimetre clear of silver medallist Tatyana Kotova.

BBC: May's leap is just enough