Fortunately, I made a right decision to come to the GAC center.
我庆幸我做了正确的决定，那就是来到GAC预科中心。
The center focus decision problem is an important part of the differential equation theory.
中心焦点判定是微分方程定性理论的重要组成部分之一。
The center focus decision problem is an important part of the differential equation theory.
中心焦点判定是微分方程定性理论的重要组成部分之一。
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