经过长期的试验．实时时钟运行稳定准确，取得了良好的效果。
The real time clock works stablely and accurately by a long time experiments.
这种生产方法是经过长期的试验和失败获得的。
This method of manufacture evolved out of a long process of trial and error.
对12根经过长期荷载作用卸载后的自密实与振捣混凝土梁进行了静力试验研究。
This paper reports the test results of 12 beam specimens including 8 SCC simple beams and 2 vibrated concrete simple beams and 2 SCC continuous beams under static loading after long-term actions.
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