在它生命周期的这一阶段，有短暂的一刻，其舌头由两个微小的半管组成，随后融合为一体。

For a brief moment during that stage of its life cycle, the tongue consists of two tiny half-tubes before merging into one.

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它也将被分割，形成纵向半管。

It will also be split longitudinally to form a half-pipe.

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首先，他们开始使用半管和垂直坡道滑板。

First, they started with half-pipe and vert ramp skateboarding.

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