等离子切割，由于融口上面大，下面小，切口断面总有一定斜度，不可能象火焰切割一样垂直，这是一世界性难题。
Plasma cutting, due to melt, the small mouth above, there is always a downward section incision, don't like probably as vertical flame cutting, this is a worldwide problem.
对于许多年龄象你们这么大的以色列孩子来说，这是他们一生中最兴奋的一夜。
For many Hebrew children about your age, it was the most exciting night of their lives!
对于许多年龄象你们这么大的以色列孩子来说，这是他们一生中最兴奋的一夜。
For many Hebrew children about your age, it was the most exciting night of their lives!
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