Firstly, how PCF's air-hole structures varied along with the applied fusion power was observed by changing fusion parameters, such as fusion time and current.
方案结合实验测量与理论计算，首先通过改变熔接时间、熔接电流等参量，考察了不同熔接功率对PCF端面气孔结构的影响。
Get along with loved ones for a long time is the secret of: give up the idea of changing object.
与所爱的人长期相处的秘诀是：放弃改变对象的念头。
Population demography is the core of the research in population ecology, which mainly deals with changing laws of the population amount along with time and space.
种群统计是种群生态学研究的核心，主要研究种群在时间和空间上的数量变化规律。
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