南非狐 卡拉哈里沙漠中的南非狐 天氣轉(zhuǎn)暖，日子更長了，這只能說明一件事-夏天的狗日已經(jīng)到了。這些海角狐貍通過在卡拉哈里沙漠嬉戲來慶祝我們的狗日。它們可能不是您通常想到的那種“狗”，但是海角狐貍與您所認識和喜愛的狗來自同一個家庭（犬科）。海角狐貍在黎明前或黃昏之后最活躍，部分是為了逃避它偏愛的沙漠灌叢中的熱量，通常在清晨和傍晚發(fā)現(xiàn)。如果您想知道“夏天的狗日”是如何產(chǎn)生的，請仰望天空。在北半球的夏季，夏至前后，名為小天狼星的恒星在冬季缺席后返回夜空。天狼星是天狼星，因為它是犬大星座的一部分，因此被譽為“狗星”，是迄今為止夜空中最亮的星。每年的這個時候，在日出之前的片刻之內(nèi)，它又在東部地平線之上再次可見。

英語原文:

The weather is warmer, and the days are longer, which can only mean one thing—the dog days of summer have arrived. These Cape foxes are helping us celebrate the dog days with their frolicking in the Kalahari Desert. They may not be the kind of 'dogs' you typically think of, but Cape foxes are from the same family (Canidae) as the pooches you know and love. Partly to escape the heat in the desert scrubland it prefers, the Cape fox is most active just before dawn or after dusk, commonly spotted during the early mornings and early evenings.If you're wondering how the phrase 'dog days of summer' came about, look to the sky. In summertime in the Northern Hemisphere, around the time of the summer solstice, the star called Sirius makes its return to the night sky after having been absent during winter. Better known as the Dog Star, because it's part of the Canis Major constellation, Sirius is by far the brightest star in the night sky. This time of year, it becomes visible again above the eastern horizon for a moment just before sunrise.

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