词典释义：
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Weightlessness means that an object loses the effect of the gravitational field.
失重指物体失去了重力场的作用。
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This amusement ride can give passengers the feeling of weightlessness.
这个游乐设施能带给乘客失重的感觉。
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Jumping from high altitude, you will feel a sense of weightlessness.
从高空跳下，你会感受到一种失重感。
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The astronauts are conducting a series of experiments to learn more about how the body adapts to weightlessness.
那些宇航员正在进行一系列实验，以便更多地了解人体如何适应失重状态。
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Astronauts in flight must adjust to weightlessness.
飞行中的宇航员必须适应失重状态。
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Astronauts are accustomed to the state of weightlessness.
宇航员们习惯于失重状态。
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You have to pay a price for this half a second of weightlessness.
半秒钟的失重状态，可是有代价的。
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For the first time, a rocket unit was fired under weightlessness.
这是火箭单元首次在失重状态下点火。
词根 weigh
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weighted adj. [数] 加权的；加重的；衡量过的 v. 加重量于…；重压（weight的过去分词）
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weighty adj. 重的；重大的；严肃的
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weightless adj. 失重的；无重量的
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weightily adv. 重要地；沉重地
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weight n. 重量，重力；负担；砝码；重要性 vt. 加重量于，使变重
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weigh n. 权衡；称重量 vi. 重量为…；具有重要性；成为…的重荷；起锚 vt. 权衡；考虑；称…重量
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weighing n. 称重量；考虑权衡；悬浮 v. 称量（weigh的现在分词形式）；考虑斟酌
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weighting n. 加重，加权；衡量；（英）生活补贴 v. 加权；称量（weight的现在分词）
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weightiness n. 重；重要性