struma

例句：

1. 1.He had a lump in his neck that doctors couldn't explain.
   他脖子上有个肿块，医生们解释不了。
2. 2. The doctor removed the struma and found it was benign.
   医生取出了肿块，发现它是良性的。
3. 3.She underwent surgery to remove the struma from her arm.
   她接受了手术，从手臂上取出了这个肿块。