Springhead
n. 根源, 泉源
✅ 同义词
🗣️ 情景例句
When you're ready to get off, remember to press the button near your seat.
当你要下车时，记得按你座位旁的按钮。
A match will set fire to a large building.
星星之火，可以燎原。
Do we have to wear the helmets?
我们得戴上防护帽吗？