Introducing material for main parts and discussing existed problems of the valve.

介绍了该阀主要零件使用的材料。

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The existed problems in this field at present are put forward, as well as the development trend.

提出了目前该领域仍存在的问题及今后的发展趋势。

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Besides, the existed problems in excessive oxidation and its application foreground were also described.

同时阐述了过量氧化存在的一些问题及其应用前景。

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These social problems also existed before Ms.Tymoshenko and her allies launched the Orange Revolution, in which they pledged reforms and prosperity.

VOA: standard.2010.02.14

But Mr Hennighan said problems existed in the town before the supermarket giant made its decision.

BBC: Machynlleth: Campaign to rejuvenate 'rundown' town

Relatively little data existed on health problems in marine mammals in the 1960s, and Dr. Kenney pioneered basic health care for many of the animals he treated.

WSJ: The Whale Doc Who Kept Sea World Healthy

But Sir Alec said that economic problems now existed, for example in the labour market, that Keynes had not foreseen.

ECONOMIST: Sir Alec Cairncross