competing reaction

例句：

1. 1. The scientist was studying the chemical properties of different metals to find a better alloy for their car engine.
   这位科学家正在研究不同金属的化学性质，以找到更好的合金来制造他们的汽车引擎。
2. 2. In the competition, the athletes were competing for the gold medal.
   在比赛中，运动员们为了金牌而竞争。
3. 3. The researchers found that the presence of certain compounds could cause a competing reaction in the body.
   研究人员发现某些化合物的存在可能会导致身体中的竞争反应。