热心者

例句：

1. 1. He is a very enthusiastic student who always helps others.
   他是一个非常热心的学生，总是乐于帮助他人。
2. 2.She is known for her warm and friendly personality, which makes her a popular choice among friends.
   她以其温暖友好的个性而闻名，这使得她在朋友中非常受欢迎。
3. 3.The new manager has shown great enthusiasm for the job, making everyone feel motivated to work harder.
   新任经理对工作表现出了极大的热情，这让每个人都感到更有动力去努力工作。