The process itself is referred to as adventive embryogenesis.其过程本身称为不定胚胎发生.A sharp demarcation of adventive embryos from zygotic embryos cannot be drawn.不定胚与合子胚之间不能划分出明显的界限.European goosefoot with strong - scented foliag...
...a dust particle weighing only a thousandth of a gram.重量仅有千分之一克的灰尘微粒The magazine has just published its six thousandth edition.这本杂志刚刚出版了第 6,000 期。The phone rings for the thousandth time.电话都响了一千次了。One nanosecond is equa...