competitor

例句：

1. 1. The company's main competitors are Amazon and Walmart.
   该公司的主要竞争对手是亚马逊和沃尔玛。
2. 2. He is a fierce competitor in the market.
   他在市场里是一个激烈的竞争者。
3. 3. Competitors often use advertising to attract customers.
   竞争者通常使用广告来吸引顾客。