用 used to 造句.

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用usedto造句.用usedto造句.用usedto造句.IusetocomputeryestesdayThecentralcompositedesign(CCD)wasusedtoobtainth

用 used to 造句.
用 used to 造句.

用 used to 造句.
I use to computer yestesday

The central composite design (CCD) was used to obtain the experimental design matrix, first applied to discover the optimal working conditions for selective separation.

I used to play football。我以前常踢足球

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