The oil companies countered that since the market price of oil has risen , replacing the old oil now cost more and thus raising the price of gasoline was justfied by current market conditions .

石油公司反驳因为石油市场价格上涨了，因此替代原来的石油成本会增加，因此根据市场条件提高汽油的价格是在情理之中。

The lesson fees are much lower than the current market price for other one-to-one language learning services and the system is much more effective than language CDs.

最人性化收费机制，按照学习时间即时计费。课程费用远远低于目前市场上的一对一语言服务收费，而且更加有效。