A hermetic seal is used at the top of this sample box.

这个样品盒的口用封条封着。

The hermetic seal on the packet means that the food lasts longer.

封袋上的封印表明食物能保存更长的时间。

The ceramic plates of air valves against abration, corrosion, dust, dirt, and sand.

陶瓷阀板耐磨、耐腐蚀、耐固体颗粒侵蚀，寿命长，适合各种气体、液体阀门的封。

This is an unsealed letter, don’t read it.

这是一封未封的信, 要看。

Food which has been closed up in tins is called tinned food.

封在罐头里的食品叫作罐装食品。

To protect the security and stable of film meter, should select some kinds right airproof liquate.

为保证隔膜表使用可靠性和安全性，应同用途选择合适的封液。

Applicable to acid (except vaporish acid),alkali, ammonia, vapor, oil, organic solvent ,chemistry corrosiveness, filling airtight of rotary pump.

适用（除发烟）碱，，氨，蒸气，油品，有机溶剂，化学腐蚀性介质的各种旋转泵，阀门的填料封。

Chlorhydrin rubber properties of physical and chemical. process technology. adhesivenessand use in cold reducting machines were mainly introduced.

主要介绍了氯醇橡胶的机械性能、工艺性能、粘合性能及在制冷压缩机封中的应用。

This paper introduces studying and using process of new type polyurethane sealing element,contrastes with similar import sealing element.

介绍了新型聚胺脂封件的研究开发和使用过程,并与进口同类封件进行对比,有一定的实用价值。

The article analyzes the reasion of poor effect for cuppy fixed dummy block in aluminium alloy extrusion press.

综合分析了杯碗式固定挤压垫实际封效果差的原因,针对固定挤压垫的结构进行了改进。

The optimum operating parameters is the important way to improve seal performence of pump valve and to prolon...

因此，优化泵的工作参数是提高泵阀的封性能、延长其使用寿命的重要途径。

The discharge voltage of some equipment like trigatron spark gap and so on in series compensation project is extremely important.

串补工程中封间隙等设备的放电电压准确性至关重要。

As an important part of the ship,canopy plays the role of hermetization and protection of cargo,which influences the safeness of cargo directly in transportation.

舱盖是船舶上的重要组成部分,起着封、保护货物的作用,它直接关系到货物运输过程中的安全。

The cooling system consists of two reusable sealed water filled canisters that are easily refrozen in one step without the need for multiple freezing steps.

冷却系统中含有两个可以重复使用的封的冷却体，易于冷冻，一个步骤即可完成，需要复杂的冷冻程序。

The characteristic, structure, raw materials, equipment, process, cost and applications of arched colour plated roofing are introduced. The foams act as insulator, seal and waterproofer in roofing.

简要介绍了用泡沫塑料保温、封、防水的拱形彩钢屋面的特点、构造、材料、设备、施工工艺、生产成本和应用。