signal types的用法和樣例：
例句
- In some cases, mixed signal types will limit the choice of switch cards.
在有些情況下，混合的信號類型會限制開關卡的選擇。 - For certain signal types, such as low level or high frequency, the analog backplane should not be used to avoid possible signal degradation.
對於特定的信號類型，例如低電平或高頻率，則不宜使用模擬背板，以避免造成信號劣化。
