denoting a vowel of relatively good duration or (esp in classical verse) followed by more than one consonantConditional clauses can start with Except if. Unless of course implies one thing much like ‘if … not’ or ‘except if’. …待播《紫川》，楊旭文、劉宇寧、張銘恩領銜主演，改編自老豬同名小說，以西川大