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nguyenhang29102002
2 năm trước
biểu diễn một cốc nước đục hai cái lỗ nhỏ hai bên để xâu qua 1 sợi dây dài khoảng 1m đổ nửa cốc và quay cốc .Nước có văng ra ngoài ko???.Vì sao??
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For many, the image out of the Dutch fight against the North Sea rests in the figure of a young boy valiantly saving his town by using a finger to plug a hole in the dike. But this familiar hero is a fictional one, a creation of American author Mary Mapes Dodge in her book, Hans Brinker. In reality, heroism falls on all the Dutch, who for more than a millennium have been wresting precious agricultural lands from the sea and fighting to hold on to them. Their greatest achievement - a colossal fun in the dike is known as that Netherlands North Sea Protection Works. Because much of the Netherlands lies below sea level, normal tides would daily inundate about half the country if previous generations of industrious Dutch had not raised dikes and dams. Severe storms often cause tidal waters to crash into the dikes and inundate rivers and estuaries. Although all of the coastal areas are threatened, two particularly vulnerable ones are the large tidal inlet formerly known as the Zuider Zee and the delta created by the Rhine and Meuse rivers in the southwestern corner of the country. Dutch engineers propose that the Zuider Zee be dammed and drained in the 19th century, but the government was reluctant to tackle such an immense project. Then, in 1916, a furious storm hit the Northern provinces. The difficulties of wartime agricultural production were compounded, and the way was paved for the damming of the Zuider Zee. dịch hộ mik

Most kids love to play sports. It’s important to them, but for the majority, it’s just one type of activity out of many that they do. For a small number of kids, though, a sport becomes their whole life. They spend almost all their time and energy practicing. This has both advantages and disadvantages. Sports are good for young children in many ways. Kids who enjoy sports are likely to have better health. They develop good habits of daily exercise that will keep them healthy as adults, too. Today, many children and adults are overweight, but those who love sports stay in shape. Plus, by developing their physical abilities, they will learn how to work hard towards a goal. Their achievements in sports will make them feel good about themselves. They’ll also make friends and learn teamwork. Sports, whether a little or a lot, can have positive effects. We admire the talent and dedication of young athletes, but we also wonder if they’re losing something. Their focus is very narrow. If they devote most of their time to sports, are they neglecting schoolwork? What about other interests? Children should try out many different activities. In addition, many young athletes are pressured by parents or coaches to succeed. Kids whose drive comes from inside usually do okay, but others can be unhappy and have health and emotional problems. So sports, like anything else in excess, can have negative effects too. dịch hộ miik

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