Scientists have long suspected that the lack of larval weight prevented the little ones from gaining enough momentum in the burst phase.

长时间以来，科学家一直猜测，可能是由于体重太轻让这些小鱼仔在“突破”的阶段难以获得足够的动力。

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The amount of angular momentum, say, a spinning skater has depends on both the speed of rotation, and the weight and distribution of mass around the center.

角动量的大小，取决于旋转中的滑冰选手的旋转速度、体重和绕旋转中心的质量分布。

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When it's spinning parallel to the ground, support your weight on your left foot and use your right foot to power your spin; the momentum of the hoop should carry you around.

首先从前位站姿开始；让呼啦圈逆时针转起来，当旋转和地面平行的时候，把重心放到左脚上，用你的右脚来给力；呼啦圈的动力会带动你晃动。

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Increasing the weight placed over the front wheel also decreases stability, which is why it will wobble if you slam on the brakes (your body's momentum continues forward, shifting weight on to the handlebars).

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