例句與造句

1. Human sperm cells consist of a flat, disc shaped head 5.1 flagellates, which propels the sperm cell ( at about 1 3 mm / minute in humans ) by whipping in an elliptical cone.
2. If a viewing cone is specified by four directions only ( e . g . in the horizontal and the vertical plane ), it does not become clear if it is the rectangle or the elliptical cone according to fig . 4.
3. It's difficult to find elliptical cone in a sentence. 用elliptical cone造句挺難的