Kàndào háizimen de xiǎoliǎn, tā xīn zhōng yǒngqǐ yī gǔ nuǎnliú.
Seeing the children's smiling faces, a warm feeling welled up in her heart.
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usage
暖流 has both a literal geographic sense (warm ocean current, like the Kuroshio) and a figurative emotional sense (a warm feeling flowing through one's heart). The figurative use is very common in literature.
