就算/就是⋯⋯也⋯⋯
解説
表示即使假设某种极端情况或让步条件成立，结果或结论也不会改变。
This structure expresses that even if a hypothetical or extreme condition is true, the result or conclusion remains unchanged.
例文
就算成绩最好的同学也无法回答这个问题。
Even the top-performing student couldn't answer this question.
就是你想马上瘦下来也不能每天不吃饭。
Even if you want to lose weight quickly, you can't skip meals every day.
就算他错了你也不能说他，他还小呢。
Even if he's wrong, you can't scold him—he's still young.