比如，我们的模型假设，简单的管状羽毛先于羽枝的演化，因为羽枝是由管子分化出羽枝脊才产生的。
The model hypothesizes, for example, that a simple tubular feather preceded the evolution of barbs because barbs are created by the differentiation of the tube into barb ridges.
一定的低温条件是启动油菜离体枝尖花芽分化的必要条件。
An adequate cold period is an essential condition for onset of flower bud differentiation in shoot tips of rape in vitro.
我们认为成花短枝及其叶片中这几种氨基酸和木质部液中氨基酸含量的变化与梅花花芽生理分化的关系值得进一步探讨。
The relationships between the amino acids in spurs or leaves with special content variation pattern and the physiological differentiation of flower buds remain to be investigated.
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