a hint of

Maria loved both the children. There was never a hint of favouritism.

玛丽亚对两个孩子都疼爱有加，向来一视同仁。

She added only a hint of vermouth to the gin.

她只在杜松子酒里加了少许苦艾酒。

"What a pity," Graham said with a hint of sarcasm.

“太遗憾了，”格雷厄姆略带挖苦地说道。