Floor drains in lower grade clean rooms should be fitted with traps or water seals to prevent back-flow.
低洁净级别区域的房间的地漏要有水弯或水封防止倒流。
The structure, technical parameters, main functions and design of test system for automobile water seals were introduced.
介绍了汽车水封试验系统的结构、技术参数、主要功能以及该试验系统的设计等。
Moreover, walruses and seals drive themselves through the water with thrusts of their hind flippers, but sea lions use their front flippers.
此外，海象和海豹用它们的后鳍推动自己在水中运动，而海狮用它们的前鳍。
They can't catch seals as well in the water, where there is no ice.
在没有冰的水域中，它们也无法捕捉到海豹。
In order to find fish, the seals have to cross the deep water of the bay—this is where the sharks wait.
为了找到鱼，海豹必须穿过海湾的深水区——这就是鲨鱼等待的地方。
She then separates out the whites, drops each one into a glass of water, seals the rim with her hand, and inverts it.
她会将每一只鸡蛋的蛋白分别倒进一杯水里，用手封住杯口，再把杯子倒转过来。
Seals that are weaned and have shed their downy fur are called beaters for the way they beat their flippers on the water.
断奶后褪去一身绒毛的海豹被称为打手，因其总是在水上拍打它们的鳍状肢。
Instead of waiting to be thrown into the vat of man eating seals, a lightning bolt comes out of the sky,strikes the water, all the man-eating seals die,so God saves her.
还没等到被扔进装满食人海豹的水池，一道闪电划破天空，击中池水，所有食人海豹都死了，上帝救了她。
5an instructor demonstrates water combat techniques to prospective SEALs. The sailors then pair off, and practice the technique in a pool.
教官在给准海豹队员们演示水下的作战技巧。然而队员们分别开始捉对撕杀，在池中演练实战技术。
5an instructor demonstrates water combat techniques to prospective SEALs.
教官在给准海豹队员们演示水下的作战技巧。
The water would exert less pressure on the oil and gas down below, which is why it was important that 【concrete seals】 were in place to avoid any blowout.
因为海水对石油以及井下的天然气造成的压力更小，所以为避免任何喷发，及时用【海水代替泥浆】封堵井口是至关重要的。
Grubby white and blue crystal towers, cliffs and crevasses soar up from the water, dispatching millenniums of compacted snow in the shape of seals, water lilies and bishops' mitres.
水中高耸起污白和蓝色的水晶塔、峭壁和裂隙，将海豹、睡莲和主教冠的形状千年积雪推送出去。
The oil floats on top of the jar and seals out air, leaving water to collect at the bottom, where it ACTS like a Petri dish for botulism.
油浮到罐头的顶部，封住空气，留下水在底部聚集，就像是为肉毒菌提供一个有盖培养皿。
But in South Africa waters full of baby seals, sharks attack from below with ferocious speed, propelling them out of the water with their cat.
但是，在南非附近的海水中有很多幼年海豹，大白鲨从水下以极快的速度冲出水面来，就是为了这可口美味。
For instance, how terrestrial mammals moved back into the water and evolved into whales, seals and manatees continues to puzzle Fish and colleagues.
例如，陆地哺乳动物如何回到水中，进化成鲸鱼、海豹和海牛呢？这一问题一直让Fish和他的同事困惑不解。
The bearing must be equipped with seals that are able to keep dust and water out and the grease inside the bearing.
轴承上必须有密封件，防止外部的灰尘和水分进入，也防止轴承内部的润滑油脂外漏。
Treatment of industrial water for cooling generators and filtration of sealing water to increase the service life of the turbine shaft sliding-ring seals in hydroelectric power stations.
工业水处理冷却发电机和封水增加的涡轮轴滑动在水力发电站的密封圈使用寿命过滤。
Seals are very awkward on land, but graceful in the water.
海豹在陆地上很笨拙，但在水中却悠然自得。
When out of the water, Arctic seals are in danger of being eaten by the region's number one killer-the polar bear.
一旦离开了水，北极海豹就面临着被区域头号杀手——北极熊吃掉的危险。
Q. Im noticing water in my oil. Do I need to replace my oil seals?
问题我注意到油中有水。我是否需要更换我的油封？
Swift and agile, Antarctic fur seals rely on their powerful front flippers to propel them through the water; smaller hind flippers help with steering.
动作灵活而快捷的南极海豹依靠其强大的鳍状前肢，让它们在水中顺利前行；小一些的后鳍帮助控制方向。
The Seals' water-borne missions are an inheritance from their ancestors, a small group of navy swimmers who formed the underwater demolition teams.
海豹突击队的水上任务来自于前身的遗续——一小群海军游泳健儿组成的水中爆破大队。
对海豹突击队而言，水里就是他们的家。
But now that he's grown to 175 pounds his playfulness could turn dangerous, because mature seals can hold people under water.
现在，他长到175磅了，与他嬉戏可能会有危险，因为成年海豹能把人拉下水。
Pump shaft seals use mechanical seal, pump top and bottom, respectively, equipped with water injection plug and the drain plug.
泵的轴封采用机械密封，泵体顶部和底部分别装有注水、放泄的螺塞。
In the arctic, the seals that bask on the ice or swim in the water have to be continually on the alert against the Polar bear.
在北极区，海豹无论是在冰上晒太阳还是在水中游泳，都要时刻提防着北极熊。
Seals are sporting about in the water.
海豹正在水中嬉戏。
This paper illustrates the structure and principle of double seals, analyzes the problems found in water filled test, and brings forward the improvement method.
文章介绍了双重密封的结构和原理，通过充水试验检验双重密封的各项性能，对出现的问题进行了分析，并提出了改进方法。
This paper illustrates the structure and principle of double seals, analyzes the problems found in water filled test, and brings forward the improvement method.
文章介绍了双重密封的结构和原理，通过充水试验检验双重密封的各项性能，对出现的问题进行了分析，并提出了改进方法。
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