Chromosome doublingfor somatic cells and somatic hybridization via cell fusion are effective methods to create polyploidy.
细胞融合和体细胞染色体加倍是获得杨树多倍体种质的有效途径之一。
2
For every doubling in cumulative production volume, the cost of modules has declined by about 20%.
相对而言，每次积累产量增长了一倍，价格便同时减低了20%。
3
Conventional animal breeding should be able to meet much of the anticipated doubling of demand for dairy and meat products in Asia and sub-Saharan Africa, but this may not be enough.