The requests for dry-sand, vibrating table, structure of negative pressure sanrl box and proceedings to be noticed in casting pro-cesss have been put forward definitely.
结合工厂多年的生产经验，对于砂性能、振实台和负压砂箱的结构以及负压浇注过程中的注意事项提出了明确的要求。
Sand-surfing isn't as easy as it appears, the speed could be high, a lot people were doing somersault, here is what a "pro" looked like.
沙漠冲浪，速度也可以很快的，有不少人半山腰折了在那儿翻跟斗，瞧瞧，真正高手的架势是这个样子的。
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