Energy can be divided into primary energy and secondary energy.
能源可分为初级能源及次级能源。
Hydrogen energy is one of important secondary energy sources in 21st century.
氢能将是21世纪重要的二次能源。
Thisheat energy is then transferred to a secondary loop of water.
热能然后传递给次环中的水。
On the energy conversion relationship between primary and secondary, it gets thrust.
根据初次级能量转换关系，得到推力方程。
On the energy conversion relationship between primary and secondary, it gets thrust.
根据初次级能量转换关系，得到推力方程。
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