如何将列表中的行合并成短语(帮助完成代码)？

def merge_lines_into_phrase(lines):
    phrase = ""
    for i, line in enumerate(lines):
        phrase += line
        if i < len(lines) - 1:
            phrase += " "  # 使用空格作为分隔符
    return phrase

# 示例用法
lines = ["Hello", "world", "how", "are", "you"]
merged_phrase = merge_lines_into_phrase(lines)
print(merged_phrase)