big talk 大话，吹牛He is always full of big talk, but he rarely follows through on it. 他总是说大话，却很少去做并坚持到底。talk big 说大话，吹牛The President talks big, but he doesn’t do anything.总统老说大话，但是什么都不做。brag about/of 吹嘘；炫耀boast about/of 吹牛，自夸He bragged to everyone he met about how smart his son was.他向他见到的每一人吹嘘他儿子有多聪明。Is he boasting about his car again? 他又在吹嘘他的车了吗？