慢慢来的英文表达是 "take it slow" 或 "take it easy"。它的来源可能来自于英语中 "slow" 和 "easy" 这两个词本身，表示 "慢" 或 "容易"。

例句：

Take it slow and don't overdo it. 慢慢来，不要做得过度。

Take it easy and try to relax. 放松一下，尽量放松。

I know you're anxious to start, but let's take it slow and make sure we do it right. 我知道你很想开始，但是我们慢慢来，确保我们做得正确。