import re


def normalize_en_answer(text: str) -> str:
    """英文拼写/短语答案：去首尾空白、小写、连续空白压成单个空格。"""
    return re.sub(r"\s+", " ", (text or "").strip().lower())


def en_answers_match(user_answer: str, correct_answer: str) -> bool:
    return normalize_en_answer(user_answer) == normalize_en_answer(correct_answer)