้ŸณใŒๆตใ‚Œใชใ„ๅ ดๅˆใ€ๅ†็”Ÿใ‚’ไธ€ๆ™‚ๅœๆญขใ—ใฆใ‚‚ใ†ไธ€ๅบฆๅ†็”Ÿใ—ใฆใฟใฆไธ‹ใ•ใ„ใ€‚
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MECHANICAL ENGINEERING
2475ๅ›žๅ†็”Ÿ
๐Ÿค”If itโ€™s called a Black Box, why is it orange? ๐Ÿ’€ maybe to reveal its dark secrets.

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