do something likely to cause difficulties for oneself later自讨苦吃，自找麻烦
rule someone or something with a rod of iron
control or govern someone or something very strictly or harshly严加控制，对…实行专制统治
spare the rod and spoil the child
(proverb)if children are not physically punished when they do wrong their personal development will suffer(谚)孩子不打不成器
英语四级真题
But later on, it led to the invention of the lightning rod.
出自-2015年12月听力原文
Ben Franklin,one of America's founding fathers, didn't just invent the lightning rod.
2019年6月四级真题（第三套）阅读 Section B
英语六级真题
What does the man imply about Rod?
出自-2014年6月听力原文
Rod said he wanted to get involved in student government this year.
出自-2014年6月听力原文
And in fact our admiration for the comically gifted is relatively new and not very well-founded, says Rod Martin's a psychologist at the University of Western Ontario.
出自-2013年12月听力原文
What has psychologist Rod Martin found about humor