103 Water Sports-Mid

Water Sports FOCUS Question How do people move in the water?

水上运动焦点问题人们如何在水里移动?

People Power Do you like playing in water? Maybe you like to swim or ride in a boat. There are many ways to enjoy water and water sports. Moving in water is different from moving in air. People need a force to move through both. A force is a push or a pull. But it is harder to move through water. They need more force.

你喜欢玩水吗? 也许你喜欢游泳或划船。 享受水上运动的方式有很多。 在水中移动和在空气中移动是不同的。 人们需要一种力量来穿越两者。 力是推或拉。 但是在水中移动就困难多了。 他们需要更多的武力。

Sometimes people use machines to move in water. People use a paddle to make a canoe move. They push the paddle toward the back of the boat. The canoe moves forward. Two people using paddles can make the canoe go faster. Safety! Always wear a life jacket when on a boat!

有时人们用机器在水中移动。 人们用桨使独木舟移动。 他们把桨推向船尾。 独木舟向前移动。两个人用桨可以使独木舟划得更快。 安全!在船上一定要穿救生衣!

Wind Power Wind can help people move a sailboat. The wind pushes on the sails. The sailboat moves forward through the water. The wind blows harder. The sailboat moves faster.

风能帮助人们移动帆船。 风推动船帆。 帆船在水中前进。 风吹得更猛了。帆船走得更快了。

People can use wind to ride on a sailboard. The wind pushes the sail. The sailboard moves forward through the water. The sailboard goes fast when the wind blows hard. Hold on!

人们可以利用风在帆板上滑行。 风推动帆。帆板在水中向前移动。 风猛时，帆板跑得很快。 坚持住!

Motor Power People can use a motorboat to water-ski. A propeller on the motor turns and pushes water away from the boat. The boat moves forward. Skiers hold on tight to a line. The boat pulls them. To stop, they let go of the line. Math Moment Which kind of power can move a boat fastest through the water? SPEED RECORDS OF BOATS Kind of Power That Moved the Boat Speed in Kilometers per Hour (kmph) People 34 Wind 120 Motor 511

人们可以用摩托艇滑水。 马达上的螺旋桨转动，把水从船上推开。 船向前移动。滑雪者紧紧抓住一条线。 船拉着他们。为了停下来，他们放开了队伍。 哪种力量能让船在水中移动得最快? 船的速度记录船移动的动力以公里每小时为单位的速度人34风120电动机511