cost是开音节

不是，是闭音节: /kɒst/

n. 费用，代价，成本损失诉讼费用

v. 成本为……花费使付出使花许多钱（非正式）给……估价It cost him five hundred quid.

它花费了他500英磅。

Success has cost him dearly.

他为成功付出了高昂的代价。

The cost ran into the thousands.

成本达到千位数。

The cost includes transit.

成本中包括运费。

The cost given is only approximate.

所列成本仅系约计。