fall back的音標是[?f??l b?k]，基本翻譯是“撤退；退回；退后；退縮”，速記技巧是：back可以理解為“后面”+fall可以理解為“落下”→落下后面→退后。

"fall back"這個詞的英文詞源可以追溯到古英語中的"falle"和"bake"，意為“倒退”或“撤退”。它的變化形式包括過去式"fell back"，過去分詞"fallen back"和現在分詞"falling back"。

相關單詞：

1. "retreat"：這個詞與"fall back"有相似的含義，都表示撤退或后退。它源自中世紀英語中的"retreat"，意為“撤退，退卻”。

2. "evacuate"：這個詞意為“撤離，撤退”，源自古英語中的"evacan"或"evacian"，意為“驅逐，驅趕”。

3. "reverse"：這個詞意為“反轉，逆轉”，源自拉丁語中的"reversus"，意為“轉向相反方向”。

4. "retard"：這個詞意為“延遲，推遲”，源自拉丁語中的"retardus"，意為“慢下來，延遲”。

5. "fallback"：這是一個合成詞，由"fall back"和"support"組成，意為“后備支持”。

6. "rearback"：這是一個動詞短語，意為“向后仰”，源自"rear"（向后仰）和"back"（后部）。

7. "recuperate"：這個詞意為“恢復，康復”，源自拉丁語中的"recuperare"，意為“恢復，康復”。

8. "retrospective"：這個詞意為“回顧的，追溯的”，源自拉丁語中的"retro"（向后）和"spectare"（看）。

9. "retrogression"：這個詞意為“倒退，衰退”，源自拉丁語中的"retrogratus"，意為“向后走”。

10. "backlash"：這個詞意為“反作用力，反彈”，源自英語中的"backlash"，指機械上的反向沖擊力。

常用短語：

1. fall back on sb/sth：依靠某人/某物

例句：She fell back on her family for help.

2. fall behind：落后，不及格

例句：If you don"t study hard, you"ll fall behind.

3. fall in with：符合，與…一致

例句：The plan fell in with our wishes.

4. fall off：下降，減少

例句：The sales have fallen off sharply this year.

5. fall out with：與某人發生爭執

例句：She fell out with her best friend over a trivial matter.

6. fall prey to：成為…的犧牲品

例句：He fell prey to the temptations of the world.

7. fall short of：達不到，未滿足

例句：The project fell short of expectations.

英文小作文：

標題：Fall Back on My Roots

As the leaves fall from the trees and the days grow shorter, I find myself reflecting on my past and my roots. I remember my childhood days, playing in the fields with my siblings and laughing with my family around the fireplace. I recall the warmth and security that came from being surrounded by family and friends.

Now, as I fall back on my roots, I realize that I am stronger than I ever was before. I am not afraid of falling behind or falling short of my goals because I know that I have the strength to rise up and overcome any challenge that comes my way.

I am reminded of the importance of family and friends, and how they can help me through any difficult times. I am reminded of the beauty of nature and how it can inspire me to appreciate the simple things in life. And I am reminded of the resilience of the human spirit, which can overcome any obstacle if we have the courage to fall back on our roots and believe in ourselves.