当美国投资者Christpher Sholes在19世纪60年代开发了第一台现代的打字机的时候，键盘的布局是根据字母顺序排序的。
When American inventor Christopher Sholes developed the first modern typewriter in the 1860s, the keyboard layout was in alphabetical order.
Tom说道，“我们将拥有面向中文/希伯来语/阿拉伯语的文本方向、垂直文本布局、双向文本布局，还有对复杂脚本和连体字母的支持”。
"We'll have text orientation, vertical text layouts, bidirectional text layouts for Chinese / Hebrew / Arabic [languages] and support for complex script and ligatures".
题目如下，输入一串数字，根据电话键盘布局输出此数字可能代表的字母组合。
Given a digit string, return all possible letter combinations that the number could represent.
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