bao ha造句

• Professor lin bao has indicated that short - term experiments showing the reliance on n fertilizer were initially effective , however as time progressed evidence of nutrient resource depletion became clear
  林葆教授指出，长期试验表明了对氮肥的依赖性在短期内就是有效的，但随着时间的增长养分资源耗竭的证据越来越明显。