But in fact both these squares are of same colors as shown in the second picture.

但事实上，这两个方块是同样颜色，如第二张图片所显示。

youdao

These squares are identified by two-letter digraphs: the first letter is the east-west position within the longitude zone and the second letter is the north-south position.

这些方块使用两个相连的字母标识：第一个字母表示经度区的东西位置，而第二个字母表示南北位置。

youdao

But the "h" isn't in a square, so I'd tap the blank space between these squares.

WSJ: From QWERTY to Quirky: New Ways to Type on Glass

Typing words with letters that aren't in squares requires using the blank space in the middle of these squares.

WSJ: From QWERTY to Quirky: New Ways to Type on Glass

Landing on these squares can pitch you into a press conference, make you answer manifesto questions, deal with leaks of information or set up telephone canvassing campaigns and challenge opponents to head-to-head debates.

BBC: Playing the politics game