unassignable costs的用法和样例：
例句
- It was originally introduced by registries so that registrars could avoid costs if a domain name was mistyped or misspelled during the registration process.
它本来是所提出的登记册，使官可避免成本，如果一个域名被拼写错误或拼写错误在注册过程中。 - The commission didn't raise retail prices, keeping the higher costs from hitting consumers and business but pressuring grid operators in the middle.
发改委没有上调零售电价，避免成本上升直接给消费者和企业带来冲击，但此举却加重了中间电网运营商的压力。
