苏晓明，张庆灵，广义周期时变系统，科学出版社，2006。

Xiaoming SU, Qingling Zhang, Periodic Time Varying Descriptor Systems, Science Press, 2006.

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我把书拿给收银员正要交钱时，晓明气喘吁吁地说：“没有呀？”

"I gave the book to the cashier to pay the money, panting xiaoming said:" no?

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当我看完一小部分决定买下时却发现晓明站在我的身旁。

When I finish reading a fraction of the time you decided to buy xiaoming, standing at my side.

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