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nitrogen cycle
agric.	氮素循环
anim.husb.	氮素循环
ecol.	氮循环
tech.	氮的循环
nitrogen cycle The complex set of processes by which crops acquire the large amount of nitrogen they need to make proteins, nucleic acids and other biochemicals of which they are composed, and how the nitrogen returns to the atmosphere
environ.	氮循环 (庄稼获得大量的它们需要合成蛋白质、核酸和其它生化物质的氮，及氮如何回到空气的这套复杂的过程。)

nitrogen cycle : 13 phrases in 8 subjects

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