I prefer the daisy and the knapweed in particular 我特别喜欢雏菊和矢车菊。
2.
Investigators have found that the knapweed ' s roots exude a toxin that builds up in the soil 研究者发现，这种矢车菊根部分泌的一种毒素会渗进土壤里，使得其他植物的细胞大量死亡，并抑制萌芽与生长。
3.
The spotted knapweed is an intruder from eastern europe that over the past century has displaced indigenous grasses and degraded pastures in north america 斑点矢车菊这种来自东欧的侵略者，在过去一个世纪中已取代北美洲的原生野草，并危害到牧草的生长。
