They were using these supernovae to measure how the universe's expansion is changing with time.
科学家们通过研究那些超新星去测量宇宙膨胀随时间的变化。
In the 19th century, however, evidence began to accumulate that the earth, and the rest of the universe, were in fact changing with time.
然而，19世纪开始，越来越多的证据证明，事实上地球以及宇宙都随着时间的变化而变化。
However, the relative incidence of cancers is changing with time.
然而，癌症的相对发病率是随时间而变化的。
The thickness of sea-ice changing with time depends on the temperature, wind and ocean current .
海冰厚度随时间的变化取决于温度、风和海流。
Hall magnetometer can be used to measure stable magnetic field and the magnetic field changing with time.
霍耳磁强计可测量稳恒磁场及随时间变化磁场。
The main problem to calculate the emf within a rotating coil is to find out the magnetic flux which is changing with time.
计算旋转着的线圈中的电动势的主要问题是求出线圈中随时间而变化的磁通量。
Magnetic fields generate error voltages in two circumstances: 1 if the field is changing with time, and 2 if there is relative motion between the circuit and the field.
在两种情况下磁场会产生误差电压：1磁场随时间变化。2在电路和磁场之间存在相对运动。
The rule of the intracellular microcystins changing with time was explored, and the influence of environmental conditions on intracellular microcystins level was discussed.
研究了细胞内微囊藻毒素随时间的变化规律，并探讨了环境因子对细胞内微囊藻毒素产生的影响。
Thermogravimetry analysis(TGA) and Dynamic Stress Rheometer(DSR) were used to measure the conversion and viscosity changing with time during the thermopolymerization to form polythioetherimides.
用热重分析仪 （TGA）和动态应力流变仪 （DSR）分别测量了聚硫醚酰亚胺热聚合反应过程中转化率和粘度随时间的变化。
Thermogravimetry analysis(TGA) and Dynamic Stress Rheometer(DSR) were used to measure the conversion and viscosity changing with time during the thermopolymerization to form polythioetherimides.
用热重分析仪 （TGA）和动态应力流变仪 （DSR）分别测量了聚硫醚酰亚胺热聚合反应过程中转化率和粘度随时间的变化。
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