americanumCOCA²³⁴⁵¹⁴BNC¹²⁶⁴¹⁶⁺⁴ 基本例句 🌏美洲乳齿象；美洲分支；穗花赛葵 In this thesis, Based on the comparison of different sowing date of parents in Pennisetum americanum x P. purpureu, to present the best sowing time for parents in Pennisetum americanum x P. purpureu. 本文通过对杂交狼尾草亲本的不同播种期试验对比，提出了杂交狼尾草亲本的最佳播种时间； fabiao