例句與造句

1. The columella arcuated and terminates at the base by a sharp, and slightly projecting keel.
2. This is followed by a broad concave fasciole, margined in turn by a sharp projecting keel which determines an angle in the contour of the shell.
3. The left lip forms a plate which laps over upon the body of the shell, and gives rise to a small projecting keel, which is terminated below by a pointed and oblique tooth, from whence a rounded fold is given out, which is observed to wind spirally into the cavity.
4. It's difficult to find projecting keel in a sentence. 用projecting keel造句挺難的