课外阅读能扩大学生知识的视野，获取时代的信息，运用思索，比较，点燃智慧的火花，在选择性阅读中得到经典知识的愉悦，从而达到以读促写的目的。

Reading out of class helps students to broaden their horizon and get information of the times. They will learn to appreciate the classic knowledge while reading only to improve writing by reading.

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合成孔径成像系统在获得高截止频率的同时，降低了系统的中频性能，并且合成孔径成像系统的信息获取在方向上具有可选择性。

The cut-off spatial frequency is got higher at the cost of the loss of mid-spatial frequency, and the information got by the system are different in all directions.

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