It is expounded that photon technology possesses the position in present day electron technology as well as such courses offered in electron technology specialties are of great importance.

阐述了光子技术在当代电子技术中的地位和电子技术类专业设置光子技术类课程的重要性。

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The position at the present day is absolutely different. We now know roughly the actual extent of the earth's surface.

今天的情况就完全不同了，我们大致已经知道地球表面的实际范围。

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In the Middle Ages, for example, city-states in present-day Italy or Spain traded from a position of strength with north European suppliers of textiles and north African sellers of gold.

ECONOMIST: History��s most important sea