To well control the tube wall temperature of reformer, well adjust top spring hanger on the reformer tube and well control the flame from burner on the top of furnace is important during operation.

在操作中，要控制好转化炉管的壁温，调整好转化炉管顶部的弹簧吊架，调节好炉膛顶部的烧嘴火焰。

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"When the bottom of the mountain is summer, the top is spring and while the foothill is autumn, the top is covered with ice," local people say of the special climate of Shennongjia.

当地的人们这样形容神农架的特殊气候：“山脚下是夏天，山顶是春天，山脚下是秋天，山顶被冰雪覆盖。”

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Because of the cold temperatures, the tundra has two layers: top layer, which is called the active layer, is frozen in the winter and spring, but thaws in the summer.

由于寒冷的气温，冻土带有两层：最上面的一层被称为活动层，在冬季和春季被冻结，但在夏季解冻。

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He would try to explain it this way when students asked for a top grade just for studying hard in chemistry class: What if a baseball player came to spring training and worked harder than all the others, but still could not play well.

VOA: special.2009.03.12

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