?一丝一毫

一丝不茍 dot the i's and cross the t's 一丝一毫 an iota 银丝族 the older generation (respectful term), old folk, silver haired generation ..

?很小一点儿

也形容赤身露体 [ a tiny bit;an iota ] 很小一点儿 [ in a terrible condition;in a awful state; complete mess ] 全部处于乱七八糟状态 ..