She put the bottle on the coffee table beside him, banging it down hard. He started at the sound, his concentration broken.
她把那个瓶子砰地一声放在他身边的咖啡桌上，他被这声音吓了一跳，注意力被打断了。
Table tennis is a sport that requires great concentration.
乒乓球是一项需要十分专注的运动。
The orthogonal test table L9 (34) was used to optimize 3 factors, namely HCl concentration, reaction time and reaction temperature.
以还原糖得率为指标，采用L9(34)正交设计对酸浓度、反应时间、反应温度的参数进行优选。
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