| 词汇 | 无底洞 |
| 释义 | 无底洞 wúdǐdònɡ noun bottomless pit ▸ figurative 他简直是个无底洞，不管你给他多少钱，他都不满足。 He was like a bottomless pit: no matter how much money you gave him, it was never enough. |
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