Clinical study on safety of labor analgesia with in halation of laughing gas .

笑气用于分娩镇痛的安全性的研究。

The shadow brandishing through the snowflake , sees the sun resemble the fireball dragging a tail , issues the slight halation , such as luna in pouring reflect on water , be quite confused and stupefied , clearly go out to go out .

透过雪花舞动的影子，看到太阳像个拖着尾巴的火球，发出淡淡的光晕，又像倒映在水中的月亮，恍恍惚惚、明明灭灭的。

Halation : this is the result of light passing through the light sensitive emulsion , then through the film base , and finally being reflected back from the other side of the film and re-exposing the emulsion , but in a different place from the original one .

光晕：光线穿过感光药膜到菲林片基而反射，使药膜再次曝光。因反射曝光与原本曝光的位置不同，故造成光晕。