There is also a wind indicator on the clock tower with a gliding sailing boat model in the middle.
钟楼上还设有风向仪，中间镶有一座鎏金英国帆船模型。
The weakness of usual portable clock model is pointed out and a new model considering the rate between portable clock and standard clock is given.
指出了常用搬运钟法计算模型中存在的不足，给出了考虑搬运钟与标准钟速率差的计算模型。
Based on a numerical model cesium atomic clock designed before, the influence of atomic velocity distribution consisting of two peaks and three peaks has been studied respectively.
基于已建立的小型铯原子钟计算机模型系统，研究了铯束原子速度为双峰分布和三峰分布对原子钟微波频谱的影响。
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