People with dark skin may observe the onset of vitiligo at any time.

皮肤黝黑的人可能会发现在任何时候白癜风的发病。

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The time of onset of pain has diagnostic importance .

疼痛开始的时间有诊断意义。

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The primary end point was the time to the onset of unequivocal relief.

最初终点为至明确缓解开始的时间。

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The primary end point was the time to the onset of unequivocal relief.

最初终点为至明确缓解开始的时间。

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