取垂直分区，从短到长修剪，分区往前带一片。
Take vertical section, cut from short to long. Section cut at the previous.
这类材料的合成研究呈现出共轭链由短到长，分子由简单到复杂，由一维到多维的趋势。
Studies on the synthesis of these NLO materials show the evolution of conjugated chains longer, molecule structure more complex and multi-dimensional.
请拿把长尺子到这儿来，把这把短的带走。
Please bring the long ruler here, and take the short one away.
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