在列表元素中保留前X个单词，同时保持列表的一个维度？

def keep_first_x_words(lst, x):
    result = []
    for item in lst:
        # 将每个元素转换为字符串类型
        item_str = str(item)
        
        # 拆分字符串为单词列表
        words = item_str.split()
        
        # 保留前x个单词
        first_x_words = words[:x]
        
        # 将保留的单词列表重新组合为字符串
        result.append(" ".join(first_x_words))
    
    return result

my_list = ['Hello World', 'This is a sentence', 'Keep only first few words']
result = keep_first_x_words(my_list, 3)
print(result)

['Hello World', 'This is a', 'Keep only first']