Use the arrow-pad or the keys 4, and 6 to move the point cursor left or right and the 5 key to add the next bubble.

使用方向键或4号键和6号键去控制指针向左或向右移动并且用5号键去发射下一个泡泡。

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You can do that quickly without having to hold down an arrow key to move your cursor.

ENGADGET: VIM 101: a quick-and-dirty guide to our favorite free file editor