以下为句子列表：
英文: A leap second is added to keep uniform timekeeping within 0.9 second of the Earth's rotational time, which can speed up or slow down because of many factors, including ocean tides.
中文: 增加这一闰秒是为了保证协调世界时（原子时）和地球自转时间（天文时）之间的差距控制在0.9秒以内，地球自转速度的加快或减慢受到很多因素的影响，潮汐就是其中之一。
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英文: Abstract: The far-field spot characteristics of laser converted by random phase plate are analyzed theoretically,including the shape,size,rotational symmetry and diffractive efficiency of the spots,as well as the distribution of subsidiary spot.By compari
中文: 文摘:从理论上分析了激光经随机位相板变换后在远场的光斑特性(包括光斑的形状、大小、旋转对称性、衍射效率以及旁瓣分布)，通过比较三种形状位相元(等边三角形、正方形和正六边形)的远场光斑特性，得知正六边形位相元结构的随机位相板更适合于激光聚变中的束匀化。
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英文: Adopted unique ventilation system and rotational direct current motor stabilize the hot airflow.
中文: 采用独特的导风系统及旋转式直流电机,恒定预热风量。
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英文: A new cooling technique based on thermal driving in high centrifugal field (TDHCF) is developed for gas turbine rotational components, such as turbine blades.
中文: 实验中分别采用了液态H2O和氟利昂R12为热驱动介质,分析了离心力场下热驱动运动的流动规律和换热特性,讨论了TDHCF技术的总平均换热效果KH随旋转速度和热流密度的变化规律。
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英文: A study on rotational characterization of Crookes radiometer
中文: Crookes光辐射计转动特性研究
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