Artificial intelligent assistant

wistful

wistful
/ˈwɪstfl; `wɪstfəl/ adj
full of or expressing sad or vague longing (esp for sth that is past or unobtainable) 发愁的, 渴望的(尤指过去的或不可得的事物)
    wistful eyes 露出渴求目光的眼睛
    a wistful mood 愁苦的心情.

牛津英汉双解词典

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