主要区别是含义不同。
1、by heart 意思是凭记性，牢记，凭记忆。
[例句] But I don't need to read them because I know it by heart.
但是我不需要读出来因为我已经深深的刻在我的心里了。
2、at heart 意思是在内心，在心里，本质上。
[例句] He always has the well-being of the masses at heart.
他总是把群众的疾苦挂在心上。
扩展资料
与 at heart、by heart 有关的词组：
1、with heart，意思是带着心。
[例句] I like the way you want to let their dough with heart pain and well-being of the sweet.
我喜欢这样想你，让自己的心有了柔柔的疼痛和幸福的甜蜜。
2、in heart 意思是情绪高涨。
[例句] Few people knew that the popular clown who had been making people fall about with laughter was lonely in heart.
几乎没有人知道，那位总让人们开怀大笑的小丑内心很孤独。
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第1个回答 2015-07-13
at heart un.1.志同道合;很合…心意;称心如意的
2.心里,从内心来说,心甘情愿的;根本,本质上.
adv.在内心里
例句：Some will tell you they have your best interests at heart; they just want you tosee the reality of the situation.
一些人会告诉你，他们是为了你着想；他们只是想让你认清现状。
At the heart of its future developments are the academic aspirations for its coreactivities of teaching and research.
未来发展的重心，在于透过教学和研究等核心活动，以施展大学的抱负。
by heart 的意思是背诵;牢记；凭记忆；熟记。
例句：Sam is really a walking dictionary. He looks as if he knows the whole dictionaryby heart.
山姆是个活百科全书。似乎他已经把字典背的滚瓜烂熟了。
He made sure that he knew every word by heart before he took the exam.
他确信已记熟了每个单词后才去参加考试。
2.心里,从内心来说,心甘情愿的;根本,本质上.
adv.在内心里
例句：Some will tell you they have your best interests at heart; they just want you tosee the reality of the situation.
一些人会告诉你，他们是为了你着想；他们只是想让你认清现状。
At the heart of its future developments are the academic aspirations for its coreactivities of teaching and research.
未来发展的重心，在于透过教学和研究等核心活动，以施展大学的抱负。
by heart 的意思是背诵;牢记；凭记忆；熟记。
例句：Sam is really a walking dictionary. He looks as if he knows the whole dictionaryby heart.
山姆是个活百科全书。似乎他已经把字典背的滚瓜烂熟了。
He made sure that he knew every word by heart before he took the exam.
他确信已记熟了每个单词后才去参加考试。
第2个回答 推荐于2017-10-08
at heart，by heart
这一组短语的涵义也各不相同。
At heart 的意思是“在心里”、“心底里”或“本质上”（from theheart，from the bottom of one's heart or essentially）。byheart 的意思是“背诵”、“熟记”（by rote；to learn so well thatone can remember it perfectly）。请看下面例句：
That socialite is a rascal at heart．
那个知名人士实质上是个坏蛋。
A councillor should have the collective interest of society at heart．
议员应当关心大众的利益。
At heart，Mr．Lin does not approve your proposal．
林先生的心里并不赞同你的建议。
Mr．Wang looks stem，but he is kind at heart．
王先生看来严肃，但买质上他很仁慈。
I know this poem by heart．
我熟读／我能背诵这首诗。
I don't see the point of learning by heart all the dates in the history book！
我真不明白为什么要把历史书里所有的日期都要记下来！
请注意下列短语的意思：（跟前例 have something at heart相近）
in one's heart of hearts 在内心深处
take something to heart 认真考虑／关注某事
set one's heart on something 决心做／得到某事／物
cut（or touch）sb to the heart 触及某人痛处
one's heart is in something 把整个心放在某事上本回答被提问者和网友采纳
这一组短语的涵义也各不相同。
At heart 的意思是“在心里”、“心底里”或“本质上”（from theheart，from the bottom of one's heart or essentially）。byheart 的意思是“背诵”、“熟记”（by rote；to learn so well thatone can remember it perfectly）。请看下面例句：
That socialite is a rascal at heart．
那个知名人士实质上是个坏蛋。
A councillor should have the collective interest of society at heart．
议员应当关心大众的利益。
At heart，Mr．Lin does not approve your proposal．
林先生的心里并不赞同你的建议。
Mr．Wang looks stem，but he is kind at heart．
王先生看来严肃，但买质上他很仁慈。
I know this poem by heart．
我熟读／我能背诵这首诗。
I don't see the point of learning by heart all the dates in the history book！
我真不明白为什么要把历史书里所有的日期都要记下来！
请注意下列短语的意思：（跟前例 have something at heart相近）
in one's heart of hearts 在内心深处
take something to heart 认真考虑／关注某事
set one's heart on something 决心做／得到某事／物
cut（or touch）sb to the heart 触及某人痛处
one's heart is in something 把整个心放在某事上本回答被提问者和网友采纳
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