要表达“开心快乐每一天”的生活秘诀用英语，可以有以下几种方式：
- “The secret to a joyful life is living each day with happiness.”
- “The key to a life filled with joy is to be happy every single day.”
- “The secret to a life of happiness is to cherish joy every day.”
- “To live a joyful life, the secret is to be happy each and every day.”
- “Embrace the secret of living a life of happiness: be joyful every day.”
- “The magic to a blissful life lies in finding happiness in each and every day.”
- “The formula for a life of joy is to be happy each and every moment of every day.”
- “To unlock the secret of happiness, live with joy in every single day.”
- “The secret to a life of bliss is to be happy each and every day.”
- “The recipe for a life of happiness is to savor joy each day without fail.”
这些表达方式都传达了同样的信息，即保持每天快乐是过上幸福生活的重要秘诀。
