pain后面加什么

1、Chest pains can be a warning signal of heart problems.胸部疼痛可能是心脏病的报警信号。

2、Pain acts as a natural defence mechanism.疼痛算是一种自然防护机制的作用。

3、She was at great pains to stress the advantages of the new system.她极力强调新制度的优点。