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我正在使用 Arduino 和OPEN-SMART 触摸屏扩展板,它使用 Adafruit_GFX 库。我需要打印整个 UTF-8 中的字符,例如带有变音符号、希腊字母等的字母。如果我尝试使用默认字体打印这些字符,它会打印一些废话。我应该怎么办?