"spare no pains to do sth." 这个短语的意思是不遗余力，全力以赴去做某事。例如：

1. They spared no pains to ensure that the project was completed on time and to the highest standards.

2. The scientists spared no pains to gather data and conduct experiments to find a cure for the disease.

3. She spared no pains to help her students understand the complex concepts, often staying late after class to answer their questions.