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请问下ContractData类型 字段的意思 例如 size 是指的什么? _option_strike_ 是指的什么呢? option_strike,option_underlying,等等都代表什么意思呢?

class ContractData(BaseData):
    """
    Contract data contains basic information about each contract traded.
    """

    symbol: str
    exchange: Exchange
    name: str
    product: Product
    size: float
    pricetick: float

    min_volume: float = 1           # minimum trading volume of the contract
    stop_supported: bool = False    # whether server supports stop order
    net_position: bool = False      # whether gateway uses net position volume
    history_data: bool = False      # whether gateway provides bar history data

    option_strike: float = 0
    option_underlying: str = ""     # vt_symbol of underlying contract
    option_type: OptionType = None
    option_listed: datetime = None
    option_expiry: datetime = None
    option_portfolio: str = ""
    option_index: str = ""          # for identifying options with same strike price
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  • size:合约乘数
  • option_开头的:期权相关属性
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