not a speck of

例句：

1. 1. She isnot a speck of help when itcomes to solving problems.
   她在解决问题时根本帮不上忙。
2. 2. He was not a speck of sorry for what he had done.
   他对自己所做的事毫无悔意。
3. 3. The weatherforecast said there would be no rain,but it turned out to be a speck of snow.
   天气预报说没有雨，但结果下了一点雪。