Sleep loss due to voluntary bedtime curtailment has become a hallmark of modern society.

自觉减少睡眠时间现象是现代社会日益突出的特点。

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This neurodegenerative disorder is characterized by rigid muscles, uncontrollable tremor and slowing - or even loss of - voluntary movements.

这种神经退化导致的机能失调特点在于肌肉僵硬，止不住发抖以及有意运动慢或者是没有。

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It went into voluntary liquidation on Tuesday with the loss of 17 jobs.

BBC: Rekindle: Charity's ?10,000 appeal as it faces closure

If spending is funded by voluntary saving and invested according to profit and loss considerations, it tends to be productive and hence, add to our prosperity.

FORBES: Since Monetary Spending Is Unequal, Who Spends Wisest?