处理多个浏览器时可能遇到的一个实际问题就是如何避免窗口混乱。
One practical problem you might run into while fiddling with multiple browsers is window clutter.
受热面污染作为燃煤电站锅炉运行中一个不可避免的实际问题，对锅炉的安全经济运行带来严重影响。
Slagging and fouling on heat transfer surface is a familiar and unavoidable problem of power boiler, which is adverse to keep boiler running safely and economically.
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