This article reveals the characteristics of vertical distribution and rule of vertical spread of airborne SO_2 in Guangzhou city through analysis of the data of airborne SO_2 vertical distribution.

通过对广州市上空so_2垂直分布数据的分析，揭示了广州市上空so_2垂直分布特征及垂直扩散规律。

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"That made the fire quickly spread in vertical directions and nearby areas, forming a large-scale fire in a very short time," Chen said.

“这使得火势迅速沿垂直方向和附近蔓延，在极短的时间里形成了大范围的火灾。”陈说。

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The material spread of flame along the surface of a product orientated in a vertical plane, is determined by this test method using the apparatus shown below.

材料的火焰沿着在定位在垂直面上的产品的表面传播，是由使用以下的实验装置的测试方法所确定的。

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That is, a vertical spread can only be worth the difference between the strikes.

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In this case it is referred to as a put vertical spread, as it is in the same month with two different strikes.

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The execution of this trade would involve the purchase of the March 32 call and sell of March 33 call (buying a vertical spread) while simultaneously selling the March 33 call and purchasing the March 34 call ( selling a vertical spread) However, you put it in as one trade (a call butterfly) and then you can fill as one price on the whole trade.

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