First, they started with half-pipe and vert ramp skateboarding.
首先，他们开始使用半管和垂直坡道滑板。
The general problem of half-pipe jacket is the leakage of the welding line induced by crack.
半圆管夹套设备最常见的问题是夹套焊接部位开裂引起泄漏。
The problem of half-pipe jacket equipment is the leakage induced by cracks in half-pipe welding position.
半管夹套设备的问题，是在半管的焊接位置出现裂缝泄漏引起的。
The problem of half-pipe jacket equipment is the leakage induced by cracks in half-pipe welding position.
半管夹套设备的问题，是在半管的焊接位置出现裂缝泄漏引起的。
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