"The problem lies in the initial design, not the execution." - "Precisely! That's exactly what I meant."

precisely 是形容词 precise（精确的）加上后缀 -ly 构成的副词形式，表示"精确地、准确地"。在这里用来强调完全同意对方的观点，相当于汉语中的"完全正确"、"正是如此"。