This textbook demonstrates how to shoot planes down.
这本教材教你如何打飞机。

The textbook has 12 units.

课本中有12个单元。

The result is a boring and lifeless photograph, if you want your own art to avoid cliché and be cheese-free then avoid textbook formulas and think for yourself.

结果是沉闷和没有生命的照片，如果您想要让自己的艺术，以避免陈词滥调和奶酪，然后免费教科书，避免公式和认为自己。

Open the textbook, please.

请打开课本。

※Difficult circumstances serve as a textbook of life for people. 困难坎坷是人们的生活教科书.

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