首先，barrier()不是一个内存屏障（memory barrier）而是一个优化屏障（optimization barrier）.我认为这里的barrier（）是可以去掉的，理由是第一句一定比第三句首先执行，而寄存器的值等于内存里的值。
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研究挤出机螺杆直槽式屏障混炼元件的优化设计问题。
The optimal design of Moddock barrier mixing element on extruder screw was investigated.
镇海3 0 0 MW燃气—蒸汽联合循环发电工程采用计算机技术对噪声传播进行模拟和预测，优化了隔声屏障的设计。
Computer technology was used to simulate and forecast the noise spread in Zhenhai 300mw gas steam combined cycle power generation project. The design of sound barrier was optimized.
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