株

• Cases are known where trioecy provides for an optimal mating system .
  众所周知，单全异株为最适交配系统打下基础。
• Like organisms, viruses have variants, generally called strains .
  与其他生物一样，病毒也有变种，一般称之为株系。
• It is characterized by a relatively high production per tree and per acre .
  它的主要标志是单株产量和单位面积产量较高。
• Here is a beech by the side of a hemlock, with three pines at hand .
  这儿有株山毛榉和一株铁杉长在一起，旁边还有三株松树。
• The flower structure in one tree was different, enforcing cleistogamy .
  同一株树上的花结构不同，因而闭花受精是强制实现的。
• Lodging resistance and plant height are allowed to vary within relatively wide limits .
  抗倒伏与株高选择标准，容许变化范围较广。
• Stocks, dykes etc. can be placed in simple sequence with the sedimentary rocks .
  岩株，岩墙等可以按其与沉积岩的简单顺序放在图中。
• The rooted fascicles usually fail to produce a bud which can grow into a new tree .
  生根的针叶束往往不能产生芽而进一步长成一株树。
• The principal methods of avoiding spoilage are the use of pure yeast strains as starters .
  防止啤酒变坏的主要方法是用纯酵母菌株发酵。
• Virus spread within a field depends on the number of virus sources, the number of healthy plants .
  田内病毒传播依据病毒源数目，健株数。