求翻译：在买价买入一份期权，同时在卖价卖出一份期权，交易实现了零delta，并且可以通过买卖价差获利而不用承受方向性风险,这也叫做“倒卖策略”是什么意思？

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In the purchase price to buy into a options while selling price is an option to deal with zero delta and can be accessed by the sale price difference profit without incurring the risk that directional also called "middleman" Policy

Buys up an option in the purchase price, simultaneously sold an option in the selling price, the transaction has realized zero delta, and might through buy the selling price difference profit not to use the withstanding directive risk, this was also called “resells the strategy”

Buying an option on the purchase price, and sells an option price, trading to achieve a zero-Delta, and not subject to directional risk to profit through the bid-ask spread, also known as "scalping strategy"

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