Undergird
vt. 从底层加固, 支持, 加强
🗣️ 情景例句
What is the cost?
费用是多少？
How much does it cost to go there by ship?
坐船到那里要花多少钱？
The flames threw light onto the ceiling of the cave.
火焰照亮了山洞的顶部。