sunk cost的用法和樣例：
例句
- Costs are categorized as incremental cost and sunk cost for the sake of decision making.
為決策需要可將成本分為增量成本和沉入成本。 - The price like this can barely cover our cost.
這個價格僅能勉強支付成本而已。 - Apparently unable to foot that cost, Bali has opted for the cheapest response, which is culling.
顯然無法支付成本之餘，巴里島選擇了最便宜的反應，就是撲殺。
