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林地的降水有65%为林冠截留、蒸发,35%变为地下水;而裸露的地面,约有55%的降水变为地表水流失,40%暂时保留或蒸发,仅有5%渗入土壤。林地涵养水源的能力比裸露地面高7倍。森林可以增加大气湿度,使天空的云量增多,从而增加降水量。

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    From: Wendy and Jack Brown

    Date: September 22, 2014

    To: 8th and 9th graders at R.L.S. Junior School

    Subject: Bonjour!

    Bonjour! (That means hello in French.)

    We hope you all had a great summer. Ours was a lot of fun. We have seen so many new things and met so many wonderful people. The French gave us a warm welcome and helped us get used to living here soon. We have so many things to share with all of you. We are going to send you more emails, but here are the best parts of our holiday in France so far.

    We had a fantastic time seeing the Tour de France this summer. It is the most famous bicycle race in the world. The riders travel more than two thousand miles in about a month! We got a quick look at the riders as they sped past! After the race, our family rented bikes, and rode along part of the route that the cyclists used.

    A few of you asked whether the French really eat snails(蜗牛). The answer is yes. We went out to dinner the other day, and our parents ordered some. We each tried one and it didn't taste too bad. The snails, called escargots, are served with lots of butter. They feel a little rubbery when you bite into them, but they don't really have much taste. Mum's favourite food here is the French pastries. Dad loves the red wine. Our favourite is the fresh bread from the shop down the street.

    We went to visit the Eiffel Tower a few weeks ago. We went all the way to the top. It was a sunny day, so we could see for miles and miles into the distance. Dad doesn't like heights, so he stayed at the bottom of the tower and took pictures from the ground.

    We miss all of you a lot. Write back to us and let us know what is new at home.

Au revoir! (Can you guess what that means in French?)

Wendy and Jack Brown