4/ When paired with a fork choice rule—an algorithm used to identify the canonical version of the chain—PoS enables a consensus mechanism that blockchain nodes use to reach agreement about the network's current state such as token balances and smart contract code.
4/ 当与分叉选择规则（一种用于识别链的规范版本的算法）配对时，PoS 启用了区块链节点用来就网络当前状态（例如代币余额和智能合约代码）达成一致的共识机制。