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Low stem head in wedge cavity reduces height and weight of valve. Design pioneered by Velan. 楔腔内的低阀杆头，降低了阀门的高度，减少了阀门的重量。这些结构设计也是由Velan首创。
The lower stem is encased in a spring which forces the stem away from the seat when the valve is opened. 下阀杆包裹在一个弹簧内部，当阀门开启时，弹簧迫使阀杆离开阀座。
The lower stem pierces the diaphragms and is sealed to the diaphragms by e-beam welding. 下阀杆穿透横膈膜，通过电子束焊接来同横膈膜密封在一起。
Remove spring cage, spring and washer. Remove bottom plug. Grasp upper and lower stem lock nut with wrench and loosen. Clean or replace any damaged or worn parts. 拆卸弹簧笼，弹簧和垫圈。拆卸底部塞。用扳手抓住上部和下部阀杆锁紧螺母并且松开。清洗或更换任何损坏或磨损部件。
The upper stem mechanically connects to the lower stem, providing positive lift without the use of a spring. (See Figure 6. 上阀杆机械地同下阀杆连接在一起，不使用弹簧就提供了正的升力。
Lower stem leaves 1- or 2-pinnately compound, leaflets few. Middle lobe of lower corolla lip obcordate, margin crenulate, apex emarginate. 下部茎叶1或2羽状复叶，小叶很少。倒心形的下部花冠唇，边缘具细圆齿，先端微缺的中部裂片。
Petiole of lower stem leaves less than 3 cm; leaf blade broadly cuneate to attenuate at base; pedicels of lowermost flowers less than 2(-3.2) cm. 下部茎叶少于3厘米的叶柄；对渐狭的在基部宽楔形的叶片；最下的花少于2(-3.;2)厘米的花梗(22
When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat. 当手轮旋转到关闭位置，上阀杆推动横膈膜，横膈膜下垂，迫使下阀杆接触阀座。
The government is trying to keep a low profile on this issue. 政府力图在这个问题上保持低姿态。
Monoecious.Leaves alternate on upper stems or opposite on lower stems. 雌雄同株在上面茎或对生在下部茎上的叶互生。
The singer forced his low notes. 那位歌手勉强唱出低音。
He because of bashful but low head. 他因羞愧而低下了头。
The point of penetration through the diaphragms is sealed by E-beam welding. When the upper stem rides up and down on its threads it now moves the lower stem by a mechanical connection. 通过横膈膜的穿透点用电子束焊接来密封。当上阀杆沿着它的螺纹上下运动时，通过机械连接带着下阀杆一起运动。
The ship lay keeled over at low tide. 那艘船因退潮而倾覆。
The upper stem is threaded into the diaphragm retainer nut. When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat. 上阀杆通过丝口旋在横膈膜止动螺母里。当手轮旋转到关闭位置，上阀杆推动横膈膜，横膈膜下垂，迫使下阀杆接触阀座。
My home town lies low in a hidden valley. 我的家乡位于一个隐蔽的山谷里。
Low grades are getting Hellen down. 低分数使海伦闷闷不乐。
After a brief rally share fall back to a new low. 股票经过一次短暂回升后回落到一个新的低点。
Talking in a low voice were a man and a woman. 低声讲话的是一男一女。
Judy bent her face low over the notebook. 朱迪把脸凑近笔记本。