Its shape hasn't changed dramatically since the 1970s, but it has evolved in a way that gives it a modern, almost timeless look.
这种设计延续到二十世纪七十年代都没有改变，自那之后它的设计形式中融入了一种永恒的现代美。
The concept of teacher specialization has gone through four stages since it took shape, and professional teacher training in the international teacher education system has varied across six models.
“教师的专业化”概念的形成和建立经过了四个时期国际师范教育中对教师进行专业化培养大约经过了六种范式的变迁。
Since it is a lead wire type device. it can be attached to printed circuit boards. the relay terminal boards. etc. ; it has a space saving shape; and it is highly economical.
由于采用了引脚结构，电源防雷模块可以直接焊于印刷电路板上、接在继电器等接线端子上，从而节省安装空间， 经济适用。
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