Headspring
n. 源泉, 起源
✅ 同义词
🗣️ 情景例句
Grandpa,
爷爷，
You use the front door and I'll hit the back.
你从正门进去，我袭击后面。
He suggested that a double railway-tunnel should be built.
他提议建一条双轨隧道，这样就解决了通风问题。