time and again 是英语中历史悠久的高频副词短语，其语义核心为：反复地、屡次地、一再地，一而再再而三地；强调动作或事件多次重复发生，自带强调和威严语气，多用于正式书面，适用场景极广，尤在历史、经验、事实、规律、政策宣传等领域多用。time and time again是其加强版。
如：
They inquired about the matter time and again.
他们一再探问此事。
Facts have proved time and again the truth that energy can be changed from one form into another.
事实一再证明能量可从一种形式转变为另一种形式。
Time and again we hear these empty promises from politicians.
我们一再听到政客们这些空洞的承诺。
Our Party warned time and again that leading cadres should follow the mass lines.
我党一再三令五申领导干部要走群众路线。
I've warned you time and again not to trust his sweet words.
我一再警告过你，别信他的甜言蜜语。
She has proven her loyalty to the team time and again.
她屡次向团队证明自己的忠诚。
He apologized time and again for forgetting our anniversary.
他因忘记我们的纪念日，一再道歉。
History has shown time and again that power corrupts.
历史一再表明，权力会滋生腐败。
I've thought of you time and again since we parted.
自从我们分开后，我一次次想起你。
The company has failed time and again to meet its production targets.
这家公司屡次未能达成生产目标。
She rejected his proposal time and again, but he never gave up.
她一再拒绝他的求婚，但他从未放弃。
Soldiers have risked their lives time and again to defend the country.
士兵们屡次冒着生命危险保卫国家。
We've argued about this issue time and again in our marriage.
在婚姻里，我们就这个问题反复争吵过。
Teachers repeat the rules time and again to students.
老师一再向学生重申规则。
He's expressed his love for her time and again in letters.
他在信中一次次向她表达爱意。
The policy has been criticized time and again by experts.
这项政策屡次遭到专家批评。
I've fallen for you time and again, no matter how hard I try.
无论我多努力，还是一次次为你心动。
Rescuers searched the ruins time and again for survivors.
救援人员在废墟中反复搜寻幸存者。
We've promised to stay together time and again through hardships.
我们一再承诺，无论艰难都相守相伴。
Time and time again you ask me, do I love you?
你一次次追问我，到底爱不爱你？《北京人在纽约》
I've struggled time and again to hide my feelings for you.
我一再挣扎，想要隐藏对你的感情。《傲慢与偏见》
Hope has kept me alive time and again through these years.
这些年来，希望一次次支撑着我活下去。《肖申克的救赎》
注意：
again and again
更口语化，侧重动作一次又一次重复，常带有不耐烦、坚持或情感色彩。如：
I've told you again and again not to do that.
我一再告诉过你别干那种事。
He made a promise of help, as I pleaded with him again and again.
我再三央求，他才答应帮忙。
over and over (again)
强调同一动作无间断重复，次数感更强，多用于机械、单调、刻意重复的行为。强调无间断、连续性。如循环播放等。如：
He plays the same songs over and over
他一遍又一遍地放着同样的歌曲。
We had to do the scene over and over again, from different angles
我们不得不翻来覆去地从不同的角度拍这个场面。
I lay awake all night, turning the problem over and over in my mind.
我一夜没睡着，反复思索这个问题。
time after time
time and again 与time and again几乎完全同义，更偏美式书面，强调“一次次都出现同样结果”。如：
I've told you time after time not to do that.
我一再告诉过你不要干那件事。
You will get a perfect result time after time if you follow these instructions.
如果你遵循这些用法说明，每次都会得到最佳的效果。
Time after time, she finds herself in relationships with unsuitable men.
她总是不可避免地与不适合的男人陷入爱河。