By making things difficult for miners, they would have to spend more energy (costly) to receive rewards.
The increased costs of #mining a block would cut into profits and de-incentivize miners from running their mining rig, effectively turning off PoW.
7/
通过让矿工变得困难，他们将不得不花费更多的精力（成本高昂）来获得奖励。
增加的成本