用trigonal造句子，“trigonal”造句

A trigonal bipyramid has three equatorial and two axial positions.

The utility model provides a trigonal pencil which consists of a pencil core and a pencil body, and is characterized in that the trigonal pencil body is arranged on the periphery of the pencil core.

A new calculating method has been proposed for the elongation and twist of trigonal prism.

Color ring and a level section of A. H. Munsell color solid were analysed with regular triangle. Schemes for trigonal color design suitable for furniture design were suggested.

Catheter drainage of the bladder relieves trigonal stretch and improves drainage from the upper tract.