在水灾发生时，用英语描述某物或某人被大水冲走，可以使用以下几种表达方式：
1. 被大水冲走的直接表达
Be washed away by a big flood: 这个表达直接且清晰，强调了水流的力量和灾害的规模。
- Example: The bridge was washed away by the big flood last night.
Be swept away by a massive flood: 类似地，这个表达也强调了洪水带来的强大力量。
- Example: The entire village was swept away by the massive flood, leaving behind only ruins.
2. 使用比喻和夸张的修辞手法
Be carried off by the torrential waters: 这里使用了“torrential”来形容水势的猛烈，增强了表达的冲击力。
- Example: Many houses were carried off by the torrential waters after hours of heavy rain.
Be engulfed by the deluge: “Deluge”指的是一场大洪水，这个表达强调了洪水覆盖一切的景象。
- Example: The old tree was engulfed by the deluge, toppling over without a sound.
3. 强调意外性和突然性
Be suddenly submerged under the rushing waters: 这个表达强调了水势的迅猛和不可预测性。
- Example: The campsite was suddenly submerged under the rushing waters, taking everyone by surprise.
Be unceremoniously buried under the floodwaters: “Unceremoniously”意味着没有仪式感，突出了事情发生的突然和不公。
- Example: The farmer’s crops were unceremoniously buried under the floodwaters, devastating his livelihood.
4. 描述具体场景
Be carried away in the flood’s relentless grip: 这里用“relentless”形容洪水的无情和持续。
- Example: The child was carried away in the flood’s relentless grip, never to be seen again.
Be lost in the swirling maelstrom of water: “Maelstrom”形容的是一个旋转的涡流，常用来比喻混乱的场景。
- Example: The entire family was lost in the swirling maelstrom of water, searching for each other in the chaos.
这些表达方式可以根据不同的语境和需要来选择使用，以更生动和准确地描述被大水冲走的情景。