在厚壁管、压力容器及电站锅炉的窄间隙全位置焊接中，钨极运动轨迹是动态的。

The synthesizing control scheme is put forward based on the requilement of narrow-gap all-position welding technology in terms of the moving track of tungsten electrode.

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试试弹极运动吧！也许你曾听说过，但我怀疑很多人都没玩过。它会瞬间刺激你的肾上腺激素分泌。

Try Zorbing! You may have seen it, but I doubt many of you tried it. Creates a huge adrenaline rush.

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随着海洋变暖，一个被称为南极极锋的水体——一个支持大量海洋生物生存的营养丰富的海水上升运动——正被进一步推向南方。

As the ocean warms, a body of water called the Antarctic Polar Front—an upward movement of the nutrient-rich sea that supports a huge abundance of marine life—is being pushed further south.

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