燃料棒被束在一起放置于反应堆的核心。
The fuel rods are bundled together in the core of the reactor.
维管形成层向两侧延伸直至形成一个茎内的分生组织环，各个维管束被束间形成层联系在一起。
The vascular cambium extends to form a complete ring of meristematic tissue around the stem, the separate vascular bundles being linked by interfascicular cambium.
在该方法中，一束双环形状的径向偏振光和一束单环形状的角向偏振光被非相干地叠加到一起形成复合光束。
In this method, a double-ring-shaped radially polarized beam and a single-ring-shaped azimuthally polarized beam are incoherently superimposed.
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