Jupyter notebook's annoying grey text auto-show - jupyter-notebook

After running a cell, that cell will show gray texts; if I click on the cell, they will disappear. Anyone ever encounter something like this before?
[enter image description here](https://i.stack.imgur.com/BFHF8.png)
This is really annoying, If anyone know how to fix this, please help me.

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hope someone will be able to help me!
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I was wondering what the highlights in the source code meant in aptana. I asked all my friends and none seem to figure it out.
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