老外对你说：“The answer is zero”是什么意思？
意思是：事情 “白忙一场、毫无结果”
例句：①After spending hours trying to fix the broken machine, the answer is zero as it still doesn't work.花了好几个小时试图修理那台坏掉的机器，结果却是白忙一场，因为它还是不能运转。②Despite all the efforts he put into the project, the answer is zero due to the lack of necessary resources.尽管他在这个项目上投入了所有努力，但由于缺乏必要的资源，最后还是毫无结果。
“白忙一场，徒劳” 其它英文表达①in vain徒劳的；枉然的；无用的
例句：She searched in vain for her lost keys everywhere in the house.她在家里到处找她丢失的钥匙，却徒劳无功。
②for nothing它有两层意思，1）免费 2）徒然
例句：He worked hard on the report for nothing because his boss didn't even read it.他辛苦写的报告白费了，因为他的老板根本没看。
The kind old man gave the poor child a warm coat for nothing.那位善良的老人免费给了那个可怜的孩子一件暖和的外套。
其它跟 answer 相关的表达answer back是什么意思？answer （sb.） back = 顶嘴，回嘴不是很礼貌的方式应对长辈，领导的批评
例句：①Don't answer your teacher back when you are criticized in.当你在课堂上被老师批评时，不要顶嘴。②The boy was punished because he answered his father back rudely.那个男孩因为粗鲁地跟他父亲顶嘴而受到了惩罚。
answer the door是什么意思？意思是应声开门、听到铃声去开门
例句：He was so busy with his work that he didn't hear the doorbell and couldn't answer the door.他工作太忙了，没听到门铃响，所以没能去开门。I'm in the middle of cooking. Can you answer the door?我正在做饭呢。你能去开一下门吗？
answer the call of nature是什么意思？answer the call of nature = 上厕所
例句：The little girl felt embarrassed when she had to answer the call of nature during the.那个小女孩在上课时想上厕所，觉得很尴尬。We stopped at the rest area on the highway so that everyone could answer the call of nature.我们在高速公路的休息区停了下来，这样大家都可以去上厕所了。
answer for / to是什么意思？answer for = 对… 负责
例句：Parents should answer for their children's behavior in public places.父母应该对孩子在公共场所的行为负责。
answer to = 答复
例句：He still hasn't answered to my letter which I sent a week ago.他还没有回复我一周前寄给他的信。
