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zero age main sequence 零龄(主)星序
A main sequence of instructions. 指令的主序列。
In the H-R diagram below, our Sun is now in the main sequence. 在以下的赫罗图中,太阳正位于主序上。
In comparison to their size on the main sequence, the stars now become giants. 同它在主星序上的大小相比，恒星现在就成了巨星。
The cluster contains no main sequence stars bluer than spectral type F, other than perhaps some of the blue stragglers, since the brighter stars of that age have already left the main sequence. 这个星团除了一些蓝掉队星外，没有光谱分类在F以上的蓝色主序星，因为这些较量的恒星都已经离开了主序带。
Hydrogen to helium conversion provides the prime source of energy for stars on the main sequence. 由氢向氦的转变是主序星能量的主要来源。
Similar to other main sequence stars, hydrogen nuclei will be fused to helium nuclei in the core. 和其他恒星一样,大质量恒星会在主序阶段把氢转化为氦。
Main sequence stars have stable luminosities and sizes. To be honest, they are quite boring compare to their deaths. 主序星的光度和大小十分稳定,或者你可以说相对于恒星的死亡舞曲,主序阶段相当沈闷。
After it reaches the main sequence, the star will stay there for millions to billions of years. 一般恒星会在主序星阶段逗留一百万至一百亿年。
A heavy star at the upper end of the main sequence has a rather different later history. 在主序上端的大恒星具有很不相同的晚年史。
As these luminous and massive stars exhaust their hydrogen fuel, they begin to depart from the upper end of the main sequence. 当这些亮而且质量大的恒星耗尽了氢燃料时，它们就开始从主星序上端脱离。
When a massive proto-star approaches the main sequence, its surface temperature is low and it can not ionize the ambient gas. 当一个大质量原星接近主星序时，它的表面温度是低的，因而不能电离周围的气体。
When a massive proto -star approaches the main sequence, its surface temperature is low and it can not ionize the ambient gas. 当一个大质量原星接近主星序时，它的表面温度是低的，因而不能电离周围的气体。
It starts with a core of increased density in a molecular cloud and ends with the formation of a T Tauri star, which then develops into a main sequence star. 但是因为总能量的守恒，因此伴随著重力能量的减少，微粒的动能就必须相对的增加。
The mercury dived to ten below zero. 温度突然下降到零下10度。
Zero Aging Rate Rb Atomic Frequency Standard 无老化漂移铷原子频标实验室
He prefers to assort with people of his own age. 他更喜欢与自己的同龄人交往。
Now, men, zero in your guns at that ship. 喂，伙计们，把炮口对准那艘船。
Even the best quality rubber will perish with age. 就是最佳质量的橡胶也会因老化而腐烂。
It was five below zero last night. 昨夜温度是零下五度。