against 是一个英文介词，表示“反对”、“违反”或“倚靠”等含义，具体意义取决于上下文。
1. 反对
表示对某事持反对态度。
例句：She is against the new law.
翻译：她反对这项新法律。
2. 违反
表示违反规则、法律或规定。
例句：He was arrested for against the traffic rules.
翻译：他因违反交通规则被捕。
3. 倚靠
表示身体或物体依靠某物。
例句：He leaned against the wall.
翻译：他靠着墙站着。
They are against the idea of moving to another city.
他们反对搬到另一个城市的想法。
It's illegal to drive against the traffic lights.
在红灯时行驶是非法的。
The cat sat against the window.
猫坐在窗边。