In the beginning of the 20th century Russia was a leading country that developed the Polar Ocean with the help of linear ice-breakers.
20世纪初，借助于直线破冰船，俄国成为当时北冰洋开发的领头羊。
An electric machine with new structure and new principle is introduced and one blank in linear machine area of our country is filled.
提出了新型式新原理的电机，为我国直线电机领域填补一项空白。
There is no report about HTSC linear phase filters in our country now.
关于高温超导线性相位滤波器的研制国内还未见到相关报道。
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