忠心耿耿

loyal and devoted

1. 比尔一贯对朋友忠心耿耿。
   Bill is always loyal to his friend.
2. 他并非一贯忠心耿耿，有时支持我们，有时反对我们。
   He is inconsistent in his loyalty: sometimes he supports us, sometimes he's against us.

忠的英语翻译：

心的英语翻译：

耿耿的英语翻译：