trigonal

1.large trigonal shells.

大型棱贝壳。

2.square or trigonal double-sided inserts.

正方形或角形双面插页（或散页）广告。

3.Complex 5, 8 and 9 belong to non-centrosymmetric trigonal space group P3_121.

其中，配物5、8和9都属于方晶系，非中心对称的P3121空间群。

4.The structure shows a distorted trigonal bipyramidal configuration with five-coordinations to a central tin atom.

结果表,物中锡原子呈五配位畸变角双锥构型。

5.The crystal structure has been determined by X ray single crystal diffraction, showing a distorted trigonal bipyramidal configuration with five coordination for the central tin atom.

通过元素分析、红外光谱和氢核磁共振谱对其结构进行了表征。用X-射线单晶衍射测定了该物的晶体结构。