complain、grumble与murmur这些动词均含“抱怨、埋怨”之意。
complain : 侧重因对处境不满、待遇不公或自己有痛苦等而向别人诉说、埋怨。
- Lots of people have complained about the noise.
许多人抱怨过这噪声。 - You're always complaining!
你总是牢骚满腹！ - He complained that his boss was useless and he had too much work.
他抱怨说老板无能，而且他干的活太多。
grumble : 主要指因对处境、待遇不满或其他个人因素而愤愤不平地以低沉的声音和粗暴的态度恶意向他人诉苦或自言自语。
- 冲他发牢骚
grumble at him - 她一晚上都在向我抱怨她的兼职工作。
She spent the evening grumbling to me about her sideline.
（拓展学习：小词详解 | grumble）
murmur : 多指因不满某人或某事而背着人自言自语地发怨言。
- They were murmuring about the boss's nephew getting the job.
他们在私下嘀咕老板的侄子得到了那份工作的事。 - Already there are murmurs of discontent.
已有一些不满的怨言。
