We can decrease TSNA by ways of reducing level of precursors.
可通过控制两种前体物质的各种途径来降低烟草TSNA。
All factors of effective precursors will affect their form and accumulation of TSNA.
凡影响前体物质的因素，都会影响烟草tsna的形成、积累和含量。
The pre cured tobacco leaves of growing and ripeness do not contain TSNA, and they are formed and accumulated during curing, aging after harvesting.
大田正常生长及成熟的青烟不含TSNA，是采收后在调制、贮存陈化过程中逐步形成和积累起来的。
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