发自心底用英语怎么说呢

"From the bottom of my heart" is a common English phrase that means something is said or done with sincere emotion or feeling. It is often used to express deep love or appreciation.
This phrase likely originated in the 16th or 17th century, although the exact origin is unknown. It is a figurative way of expressing the idea that something is coming from the innermost, most sincere part of oneself.
Here are some examples of the phrase in use:
"I just want to thank you from the bottom of my heart for all your help and support." (感谢你真诚的帮助和支持。)
"I apologize from the bottom of my heart for any hurt or pain I may have caused." (我衷心地道歉，如果我给你造成了伤害或痛苦。)
"I love you from the bottom of my heart and always will." (我真诚地爱你，永远都会。)