------
## 最终结论
```python
def get_closest_vowel(word):
    vowels = "aeiouAEIOU"
    target_vowel = ""
    
    for i in range(len(word) - 1, -1, -1):
        if word[i] in vowels:
            if i < len(word) - 1 and word[i + 1] not in vowels and i > 0 and word[i - 1] not in vowels:
                return word[i]
    
    return ""
```