例句與造句

1. Some phones only have a mechanical means of switch hook operation.
2. Tosco said a labor dispute may keep it from resuming Marcus Hook operations this year, leaving the Northeast without one of its major refineries.
3. Technology from decades ago eliminated the need for such device, however many phones, including modern IP phones, still do not have discrete circuitry for switch hook operation.
4. It's difficult to find hook operation in a sentence. 用hook operation造句挺難的