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Watch Later 6:38

雜交水稻之父－袁隆平

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六常_5.4課（養分和氣體的循環）

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六常_6.5生態的破壞

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紅月降臨？是狼人出現的時候嗎？【月亮知多少】（下篇）

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月球基本認識 — 潮汐與月相【月亮知多少】（上篇）

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自然科學─月亮

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中外名人愛迪生

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愛迪生、霍金、李慧詩

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