皮下环：为胎儿时期睾丸从腹腔下降到阴囊的通道，有内外两个口，内口通腹腔，称为腹环，外口通皮下，称皮下环。
在手术的同时，在皮下放置一个连接着环的通道。
The ring is connected to a port that is placed underneath the skin at the time of surgery.
本文还叙述了SSS钢在制成紧固环，钢笔帽，内六角螺丝，金属软管以及皮下注射针工艺中的应用。
Also, the processes by which SSS is made into circlip pen-caps, blind rivets, inner-hexagon screws, hosepipes and hypodermic needles are described.
本文通过给大鼠高蛋白质食物，皮下注射醋酸考的松及其饮水中加入四环素的方法，建立了卡氏肺孢子虫大鼠模型。
Rat models of Pneumocystis carinii pneumonia were induced by feeding on high protein diet, injecting cortisone acetate subcutaneously and drinking the water added tetracycline.
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