例句與造句

1. The wood is characterized by solid pith, pink heartwood, and vessels with scalariform perforations, as well as simple perforations.
2. They have a variety of shapes : the most common are the simple perforation ( a simple opening ) and the scalariform perforation ( several elongated openings in a ladder-like design ).
3. It's difficult to find scalariform perforation in a sentence. 用scalariform perforation造句挺難的