碳循环因此又得纳入另一个亚循环，以致变得更加复杂难以理解。

The carbon cycle has thus acquired another epicycle, and become even more complicated to understand than it was.

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本文得到与广义移位算子交换的算子成为亚循环算子的一个充分条件。

In this paper, we result a sufficient condition of supercyclic operators from operators commuting with generalized backward shift operators.

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“根据地图的十分形象的比喻， 西史匹瑞亚 是“整个心脏血液循环的中心”，铁道系统是大动脉，纽约是“商业之子起源的脐带”。”

Its metaphor makes West Superior ‘the center of cardiac or heart circulation’; the railways become major arteries; and New York is ‘the umbilicus through which this man of commerce was developed’.

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So, if you look in the blood of patients that are infected with Hepatitis B you find a lot of Hepatitis B surface subunits, proteins without the nucleic acid circulating in their blood.

因此,如果你观察一下,已经感染乙肝病毒患者的血液,你会发现许多乙肝病毒的表面亚基,以及血液循环中存在没有核酸的蛋白质

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