艺术家对画作做了微妙的修改，只有专家才能注意到。

The artist made a ___subtle change to the painting that only experts could notice.

她暗示了一个微妙的线索，表明她想去听音乐会。

She dropped a ___subtle hint that she wanted to go to the concert.

你必须在使用的散热器数量和窗户开合之间找到自己微妙的平衡，以营造合适的氛围。

You will have to find your own ___subtle balance between the number of radiators you use and the opening of windows to create a suitable atmosphere.