为了使对方得到答案，他们竟发明了一套完整的密码系统：坐在右边的一位，需要知道第五题的答案时，他就用铅笔在桌子上轻轻敲五下，坐在左边的一位回敲两次——表示答案是B。

One kid would tap his pencil lightly five times indicating he needed the answer to number 5.

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但是在64位的系统中，日期是使用有符号的64位整数表示的，这可以极大地扩充其可用范围。

But in 64-bit systems, dates are expressed as signed 64-bit integers, which extends the usable range.

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Gerard Jouany，一位航空记者表示，后备系统显示飞行员曾经用无线电进行联络，并称这次悲剧是诸多未知事件一齐导致的结果。

Gerard Jouany, an aviation journalist, said that back-up systems would allow the pilots to radio, and said the tragedy must have been a combination of events that are unknown.

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