healthful的音標為[?helθful]，基本翻譯為“有益健康的；健康的”，速記技巧為“health（健康）+ ful（形容詞后綴，…的）”。

Healthful這個詞的詞源可以追溯到拉丁語和希臘語，意為“有益于健康”或“健康的”。它的變化形式包括其過去式（healthful）和過去分詞（healthful），現在分詞（healthful）和形容詞形式（healthful）。

相關單詞：

Health：這個詞直接來源于healthful，意為“健康”或“身體健康”。

Unhealth：這個詞是由un-和healthful構成的，表示“不健康”或“疾病”。

Healthy：這是health的形容詞形式，表示“健康的”或“有益于健康的”。

Healthfulness：這是healthful的名詞形式，表示“健康狀態”或“有益于健康的事物”。

Wellness：這個詞也表示“健康”或“身體健康”，但更強調心理和情感上的健康。

Hygiene：這個詞源于希臘語，意為“衛生”或“保持健康的方法”，常用于醫學和公共衛生領域。

Salubrious：這個詞源于拉丁語，意為“有益于健康的”或“適合居住的”，常用于形容地方的氣候或環境。

Vitality：這個詞表示“生命力”或“活力”，常用于形容人的身體和精神狀態。

Sanity：這個詞表示“理智”或“清醒”，常用于形容人的精神狀態，與healthful有密切關系。

以上這些單詞都與healthful有密切關系，它們在英語中有著不同的含義和用法，但都與健康和保持健康有關。

常用短語：

1. healthful eating habits

2. maintain good health

3. stay healthy

4. healthy lifestyle

5. exercise regularly

6. eat a balanced diet

7. maintain a healthy weight

雙語例句：

1. It"s important to have healthful eating habits. (擁有健康飲食習慣很重要。)

2. Regular exercise is essential for maintaining good health. (保持健康，定期鍛煉必不可少。)

3. A healthy lifestyle helps us to live longer and stronger. (健康的生活方式有助于我們活得更長久更健康。)

4. Eating a balanced diet and exercising regularly are key to good health. (均衡飲食和定期鍛煉是保持健康的關鍵。)

5. Losing weight healthily is a challenge, but it"s worth it in the long run. (健康減肥是個挑戰，但從長遠來看，這是值得的。)

英文小作文：

Health is the key to a happy and fulfilling life. To maintain good health, it"s essential to have healthful eating habits and engage in regular exercise. By eating a balanced diet that includes plenty of fruits, vegetables, whole grains, and lean protein, and by exercising regularly, we can maintain a healthy weight and keep our bodies strong and resilient. Additionally, it"s important to avoid unhealthy habits such as smoking and excessive drinking, as these can have a negative impact on our health. By making healthy choices, we can live longer, happier, and more fulfilling lives.