心正不怕雷打
A good conscience is a soft pillow.

心甘情愿
He did all this of his own accord.

心不在焉
You look absent-minded; what's wrong?

心滿意足
The little boy sat there smiling, as happy as a clam.

心力交瘁
I don't know what to do. I just burned the candle at both ends.

心灰意冷
He was in black despair when he failed in the joint examination.(down in the?bushes/in the dumps/lose heart)?

心有余悸
A burned child dreads the fires. (Once bitten, twice shy.)

心安理得
No matter what he said, I have the peace of mind. (have an easy conscience)

心血來(lái)潮
He did it just on the impulse of the moment.

心花怒放
My heart sings with joy because I receive over 300 letters a week from people around the world. ?

小Car筆記：

dread：懼怕，恐懼 【常用詞組】① in dread of someone：害怕某人 ② in dread of one's life：害怕有生命危險(xiǎn)
impulse：沖動(dòng)，心血來(lái)潮 【常用詞組】① impulse buying：即興購(gòu)買，未經(jīng)考慮僅憑一時(shí)沖動(dòng)的購(gòu)物行為 ?② electrical impulse：電脈沖

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