ビル・ゲイツのインスタグラム(thisisbillgates) - 10月4日 08時12分

I got to spend the day at Chula Vista Middle School back in April, and I’ve been excited to share what I learned—and why it made me hopeful for a future where more people develop a love for math like mine.

[BIHAKUEN]UVシールド(UVShield)

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