difficulty

Bitcoin adjusts its mining difficulty every 2016 blocks to target a ten-minute block time.比特币每 2016 个区块调整一次挖矿难度，以将出块时间目标保持在十分钟。

As more miners join the network, the difficulty increases to keep block production consistent.随着越来越多的矿工加入网络，难度会增加，以保持区块产出的稳定。