essential difference短语¹⁰⁶¹⁰⁰⁺⁵ 基本例句 主要区别 The essential difference is that the spectrum analyzer, being designed for laboratory use, is designed to cover an extremely wide frequency range with widely adjustable tuning range, bandwidth, etc. 区别在于频谱分析仪被设计成是实验室使用，设计成是带有很大可调范围和带宽等并覆盖非常大频率范围的仪器。 eefocus