chest developer

例句：

1. 1. This chest developer is designedto help you build muscle in your chestarea.
   这款胸部发育器旨在帮助您在胸部区域增加肌肉。
2. 2. The chest developer has beenproven to be effective in improving chest strengthand endurance.
   胸部发育器已被证明能有效提高胸部力量和耐力。
3. 3. I've been using this chest developer for afew months now, and I can alreadyfeel the difference in my chest muscles.
   我已经使用这个胸部发育器几个月了，我可以看到我的胸部肌肉有明显变化。