(down) to the last ... idiom
（用于强调所说的话）包括一切，包括全部
including all of the thing mentioned, used to emphasize what you are saying
The model of the village is accurate down to the last detail. 这个村庄的模型精确到了每个细节。
He has calculated the costs down to the last penny. 他把每一便士的费用都计算在内了。