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The most important route to produce these unsaturated hydrocarbons is by steam cracking, using principally petroleum gases or naphtha as feedstock.

生产这种不饱和烃类最重要的路线是靠蒸汽裂解，主要以石油气体和石脑油作原料。

It consists principally of XYLEM and PHLOEM (water and food-conducting tissues respectively), and also contains strengthening tissue and packing tissue.

它主要包括木质部和韧皮部，还含有机械组织和填充组织。

Acute phosgene poisoning cause acute lung injury principally, it can be healed in short time by combination treatment mainly included glucocorticosteroid.

急性光气中毒主要引起急性肺损伤，通过以糖皮质激素为主的综合治疗，可以在短时间内痊愈。

Any of a group of abundant rock-forming minerals occurring principally in igneous , plutonic, and some metamorphic rocks, and consisting of silicates of aluminum with potassium, sodium, calcium, and, rarely, barium.

"任何一组由大量岩石形成的矿物，主要存在于火成岩、深成岩以及一些变性的岩石中，含有钾、钠、钙及极少的钠的铝硅酸盐，地球的外层地壳中约百分之六十是长石。"

Any of a group of abundant rock-forming minerals occurring principally in igneous, plutonic, and some metamorphic rocks, and consisting of silicates of aluminum with potassium, sodium, calcium, and, rarely, barium.

长石任何一组由大量岩石形成的矿物，主要存在于火成岩、深成岩以及一些变性的岩石中，含有钾、钠、钙及极少的钠的铝硅酸盐，地球的外层地壳中约百分之六十是长石

Any of a group of abundant rock-forming minerals occurring principally in igneous, plutonic, and some metamorphic rocks, and consisting of silicate s of aluminum with potassium, sodium, calcium, and, rarely, barium.

"任何一组由大量岩石形成的矿物，主要存在于火成岩、深成岩以及一些变性的岩石中，含有钾、钠、钙及极少的钠的铝硅酸盐，地球的外层地壳中约百分之六十是长石。"

Any of a group of abundant rock - forming minerals occurring principally in igneous,plutonic,and some metamorphic rocks,and consisting of silicate s of aluminum with potassium,sodium,calcium,and,rarely,barium.

长石任何一组由大量岩石形成的矿物，主要存在于火成岩、深成岩以及一些变性的岩石中，含有钾、钠、钙及极少的钠的铝硅酸盐，地球的外层地壳中约百分之六十是长石

Was established in 2002. Principally engaged in a variety of specifications for plywood production, sales.

于2002年成立。主要从事多种规格胶合板的生产，销售。

This is not an easy or cheap procedure, but we know this is taking place, principally on porcelain.

这不是一个简单和便宜的程序，但我们知道这是存在的，大部分是发生在瓷器上。

The trouble of igntion system includes principally the following three respects: preignition, late ignition,miss firing.

点火系统的故障主要表现在三方面：点火过早、点火过晚和不点火。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。