working costs的用法和樣例：
例句
- Initial investment and operating costs usually favor the large single continuous digester.
較低的初始投資和運行費用通常使得間歇式蒸煮更受歡迎。 - But the lifetime operational costs of wireless LANs can be substantially less than those of wired LANs, particularly in environments requiring frequent modification.
但在壽命周期內，無線區域網的運行費用大大低於有線區域網，尤其是在需要頻率調製的環境中時。
