When breaking in an engine, you should refrain from high speeds for the first thousand miles.

磨合发动机时,你应当避免在最初的1千英里高速行驶。

《柯林斯英汉双解大词典》

youdao

youdao

Dr.Ahmed says people can also adjust their lifestyles: such as abstain,from smoking, indiscriminate sexual inter-course and refrain from factors known to be associated with cancer, such as drug abuse. The Nigeria Cancer Society is working with NGOs to create public awareness campaigns that include radio and television advertisements, handbills,pamphlets and other educational materials that are distributed in schools, hospitals and other public places.

VOA: standard.2010.06.16

From Ralph Brinkhaus, a local member of the German parliament, the Bundestag, to Christine Lemster, a chemistry student at Hamburg University, we heard a similar refrain - the UK and Germany ought to be natural allies, and it is too bad that they cannot unite around EU issues.

BBC: Germans united in regret over Britain's EU stance

The rest of the oft-repeated refrain for more public-private partnership is wasted.

FORBES: Why Rockefeller-Snowe's Regulations Won't Prepare The U.S. For Cyberwar

But Mr Cain has garnered lots of attention, and a lead in some polls, with his relentless refrain of 9-9-9.

ECONOMIST: The presidential race