合约单位是指一张期权合约对应的标的资产（证券、股票或 ETF）数量，即买卖双方在约定的时间以约定的价格买入或卖出标的资产的数量。
合约单位为一个主要参考货币的货币单位。
The Contract unit will be one currency unit of the primary reference currency.
期货市场交易的就是期货合约，最小的交易单位是一份合约。
Futures markets trade futures contracts, and the smallest unit that can be traded is one contract.
不幸的是Habitat 67并不像Safdie所希望的那样人人买得起，它总价为$22 195 920，每个单位折合约值$140 000。
Unfortunately Habitat 67 was not as affordable as Safdie had hoped, costing $22, 195, 920, or about $140, 000 per living unit.
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