Artificial intelligent assistant

subtle

subtle
/ˈsʌtl; `sʌtl/ adj
(-r, -st) (esp approv 尤作褒义)
1 not easy to detect or describe; fine; delicate 难以察觉或描述的; 细微的; 精细的
    a subtle charm, flavour, style 难以形容的魅力、 滋味、 式样
    subtle humour 巧妙的幽默
    a subtle distinction 细微的差别
    paint in subtle shades of pink 粉红色度略微不同的颜料.
2 organized in a clever and complex way; ingenious; cunning 巧安排的; 巧妙的; 狡诈的
    a subtle argument, design, strategy 巧妙的议论、 设计、 策略
    a subtle analysis of the problem 对该问题的精辟的分析.
3 able to see and describe fine and delicate differences; sensitive 敏锐的; 感觉灵敏的
    a subtle observer, critic, analyst, etc 细心的观察者、 评论者、 分析者等
    She has a very subtle mind. 她头脑灵敏.

牛津英汉双解词典

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