The first observation of a semiconductor emitting light when zapped with electricity dates back to 1907.
首次观察到的半导体利用电击发光要追溯到1907年。
Such ceremony has comparatively fixed dates of action and the places of worship, characteristic of earlier astronomical observation of the movement of the sun shadows.
这种仪式有比较固定的行事日期和祭祀场所，带有测度日影的早期天文学观察性质。
Such ceremony has comparatively fixed dates of action and the places of worship, characteristic of earlier astronomical observation of the movement of the sun shadows.
这种仪式有比较固定的行事日期和祭祀场所，带有测度日影的早期天文学观察性质。
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