Because adding to positions changes the total cost of the entire position on a per-unit basis toward the last price, a quick reversal to the original entry price can result in a significant loss.
因为加仓改变了整个仓位的成本，每个单位的成本都会走向最后的价格，快速的价格反转会带来巨大的亏损。
The estimated or forecast total cost in each category is the current best estimate of costs based on progress and any changes since the budget was formed.
每一项次的预计总成本是根据预算构成后项目的实际进展和变更对当前成本的最为精确的估算。
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