Experiments on simultaneous mask effect where tones were masked by narrow-band noises with different SPL showed that the masking curve could be approximated as two segments of straight line.
不同声压级下窄带噪声对纯音同时掩蔽效应的实验结果表明：掩蔽曲线可以用两段直线来近似。
The face can speak a thousand emotions but it can easily mask what the heart truly feels. The happiest face may be masking the most hurting heart.
一张脸能诉说千种情绪，却很容易掩饰心情。最快乐的面具下，也许是一颗最伤的心。
If the input character is a space, and does not match the current non-editable character in the mask, the masking engine will skip ahead to the next character in the mask.
如果输入字元为空格，而且不符合遮罩中之目前不可编辑的字元，则遮罩引擎将会略过前移到遮罩中的下一个字元。
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