Those who study life usually speak only of involution and evolution; those who study the form, namely, the modern scientists, are concerned with evolution only.
那些研究生命的人通常只是提到退化和进化。
2
The utility model discloses an involution suction pipe. The middle part of the involution suction pipe is wound to form a spiral structure.
本实用新型公开一种回旋型吸管，该回旋型吸管的中间部分绕成螺旋结构。
3
The upper end of the involution suction pipe is bent downwards to form an Angle, and the Angle is preferentially 45 degrees.