little little中间用什么介词？
用by.little by little逐渐的，一点一点地。例如，
It was little by little that the watch reached its present-day perfection.表渐渐地达到了现在这样完美的程度。
类似这种重叠的短语还有，
step by step, hand in hand，手拉手
face to face,面对面
shoulder to shoulder肩并肩
one piece by piece 一部分一部分地，一件件地
one by one 一个一个地，依次地
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