I don't even know what to make of the expression treasury funds, never heard of it.
Foreign exchange reserves are placed in the treasury. It is used to stabilize the exchange rate as well as exports - for example if our country is going to be importing equipment from Germany for a long time and the euro has risen sharply lately, then it will not be good for us to import equipment from Europe. At this time you can use the euro reserves in the treasury out into the market to buy equipment, on the one hand, did not buy equipment at a higher cost, on the other hand, the market flow of the euro more, can suppress the euro's upward trend.
In fact, this is very cumbersome and complex, here is just a simple example.
If LZ is required to specialize in this subject, he needs to at least figure out the ternary paradox. If LZ is not a professional study and just a little understanding in life and investment finance, you do not need to get this complex.