人类的褪黑激素水平在夜晚上升，以响应黑暗和昼夜节律钟发出的信号。
In humans melatonin levels rise at night, in response to darkness and cues from the circadian clock.
Visa对于此次ipo时机的把握也许显示了这样一个信号，即尽管现在市场情况可能不会转好，但对于首次公开募股，也许是黑暗中难得露出的一点微光。
The timing of Visa's impending IPO is perhaps a sign that the firm believes that market conditions will not improve, but for now the IPO itself is a rare moment of light amid the gloom.
我们的身体依靠“睡眠信号”来入睡，其中一个信号就是黑暗。
Our bodies depend on 'sleep signals' to fall asleep and one of those signals is darkness.
以莎士比亚的方式，用信号枪杀死50 个黑暗俘虏。
Defeat 50 Taken with the flaregun, the way Shakespeare intended.
以莎士比亚的方式，用信号枪杀死50 个黑暗俘虏。
Defeat 50 Taken with the flaregun, the way Shakespeare intended.
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