| ประโยคภาษาจีน : 中文句子 | 
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|  yán jiū研究  wú shuāng qī无霜期  yǎn biàn演变  guī lǜ规律  wèi为  nóng yè农业  fēng xiǎn风险  jué cè决策  qū lì bì hài趋利避害  chōng fèn充分  lì yòng利用  qì hòu zī yuán气候资源  tí gōng提供  qì hòu气候  yī jù依据 | 
| The research of the evolution principle of frost-free period would give climate resources support for risk decision making in agriculture. |