Question: saving worksheets?

I have a worksheet saved, but if I try to continue where I left off, Maple has forgotten what all the variables mean and what their values were. 

It's not like I have to retype everything - the commands are still there - but I have to press enter about a hundred times to reenforce what the meanings of all the variables were. 

Is there a way to save it in such a way that you don't lose such information?

I would like to be able to save a worksheet -> close it -> then open it up later and for example, plot a graph using the data in the worksheet, without having to redefine all the variables and such.

Is this possible?

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