94岁的杨振宁将加入数学物理系，70岁的姚期智将加入信息技术和科学系。

Yang, 94, would join the mathematical physics department, while Yao, 70, would enter the information technology and science department.

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我想有数学系，物理系，化学系和力学系。

I think they are Departments of Mathematics, Physics, Chemistry and Mechanics.

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