BTC 占比，是比特币的市值占整个加密货币市场总市值的百分比，反映比特币在市场里"有多大"。BTC Dominance is Bitcoin's market cap expressed as a percentage of the total crypto market cap — a simple measure of how large Bitcoin is relative to everything else.
这个数字升高，说明资金相对集中在比特币；降低，说明其他币种的市值在追上来。它能帮你看清市场里的钱大致在哪一层分布，而不是只盯着某一个币的价格涨跌。When the number rises, it means capital is concentrating in Bitcoin relative to the rest of the market; when it falls, other coins are collectively gaining ground. It gives you a bird's-eye view of where value is distributed across the market, beyond any single coin's price movement.