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.
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。
One familiar example of a serious problem that could not have been solved — or could not have been solved as promptly — without worldwide cooperation is the SARS epidemic.
不能得到解决的严重问题之一— 或可能不都得到及时解决， — SARS 疫情没有世界范围内的合作。
Water pollution of the Dian Lake is a great problem in Kunming City and Yunnan Province. As a worldwide difficult problem, water pollution of lake is ubiquitous in the world.
滇池的水环境污染是昆明市乃至云南省当前所面临的最大的问题，湖泊污染治理本身作为一个世界性的难题，在世界的范围内都是普遍存在的。
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