This is a photo of a tornado that hit a small town in Canada on June 22. It was one of three reported in Canada that day. Four homes were destroyed by the tornado, but luckily no one was injured.
Tornadoes can happen anywhere in the world, but the most tornadoes are seen in a place called Tornado Alley in the Mid-west of the US.
Scientists don't fully understand tornadoes, but one theory is that they form when a warm wind meets a cold wind.
PHOTO: AP
A thunderstorm high up in the atmosphere makes the layers of air move. The warm humid air from near the ground gets pushed up into the cold dry air above it. If the wind changes speed and direction, then a tornado might form.
As the two winds spiral round they form a vortex. The wind can reach up to 480km an hour! That's very strong. Tornadoes can pick up objects, animals, and even people sometimes.
If you ever see a tornado you should make sure that you get into shelter as fast as possible.
這是六月二十二日侵襲加拿大某個小鎮的龍捲風照片，據說是當天在加拿大發生的三場龍捲風之一。這場龍捲風摧毀了四間民舍，所幸無人受傷。
世界各地都有龍捲風發生，但全球龍捲風最多的地方是美國中西部的「龍捲風小徑」。
科學家並未完全了解龍捲風，但有一種理論說，當溫暖的空氣遇上冷空氣時，龍捲風就可能成型。
大氣層高空降下大雷雨時，層層的空氣就會流動。靠近地面濕暖的風，就會向上流到乾冷風中。假如風改變了速度與方向，龍捲風就可能成形。
這兩種風旋轉時，會形成渦流。風速可達每小時四百八十公里，相當強勁！龍捲風會捲走物品、動物，甚至於人類。
假如你看到了龍捲風，務必儘快躲進避難所。
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1. 他病了三天。 ˇ He has been sick for three days. χ He has been sick since three days. 註︰這裡現在完成時態 have / has been 表示從過去某一時日到現在的一段時間存在的行為或狀態，與它連用的時間副詞應為 「for ＋若干時」，如 for a year, for three hours 等，意思是歷時多少。 2. 他自從星期三以來都很忙。 ˇ He has been busy since Wednesday. χ He has been busy from Wednesday. 註︰「自從……以來」，該用 since。說從某一天（某一時刻）到某一天（某一時刻）才用 from，如 from Monday till Friday。 3. 房間角落裡散放著一些零星物件。 ˇ There were some odds and ends lying in the corner of the room. χ There were some odds and ends lying at the corner of the room. 註︰「在房間角落裡」該用介詞 in。例如： He stood in the corner. There is a lamp in the corner of the room. at the corner 指房子外部的拐角。例如： A little boy
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