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

Single clear said: Chinese people and American people different in character.

单间明了的说：中国人和美国人的性格不同。

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》

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