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1·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.

所述回旋型吸管的上端向下折弯成一角度，该角度优选为45度。