You're wasting your time with all this needless repetition so spare us the long-winded explanation.
同じことを何回繰り返すの。屋上屋を架すようなくどい説明は勘弁してよ。
Repeating a mistake without recognizing it as one, is the biggest mistake of all.
過ちを過ちと認めずに過ちを繰り返すことが最大の過ちである。
The emotion they gave me was exquisite, but I could not preserve it, nor could I indefinitely repeat it; the most beautiful things in the world finished by boring me.
Although I broke test tubes and played about with chemicals for fun, I did occasionally manage to obey the teacher's instructions as well; repeating experiments that others had long ago undertaken.
A mere repetition of other people's research cannot be called true scientific research.
他人の研究を繰り返すだけでは本当の科学的研究とは言えない。
Ontogeny recapitulates phylogeny.
個体発生は系統発生を繰り返す。
Comparing American English and British English is like counting incompatible sets of floors of a building. That's why, when you try translating over and over again between the two, it's like climbing an endless set of floors. You might even reach the moon