题目内容
strong. But you need to be quick. And you need to understand a few basic rules about the wind.
First, you must ask yourself, "Where is the wind coming from? Is it coming from ahead or behind or
from the side?" You must think about this all the time on the boat. The wind direction tells you what to do with the sail.
Let's start with the wind blowing from the behind. This means the wind and the boat are going in the
same direction. Then you must always keep the sail outside the boat. It should be at a 90° angle (角度)
to the boat. Then it will catch the wind best.
If the wind is blowing from the side, it is blowing across the boat. In this case, you must keep the sail
half way outside the boat. It should be at a 45 ° angle to the boat. It needs to be out far enough to catch
the wind, but it shouldn't flap (摆动). It shouldn't look like on a flagpole. If it is flapping, it is probably out
too far, and the boat will slow down.
Sailing into the wind is not possible. If you try, the sail will flap and the boat will stop. You may want
to go in that direction. It is possible, but you can't go in a straight line. You must go first in one direction
and then in another. This is called tacking. When you are tacking, you must always keep the sail inside
the boat.
B. Wave levels.
C. Wind directions.
D. Size of sails.
B. The wind.
C. The sail.
D. The angle.
B. Allow the sail to flap.
C. Lower the sail.
D. Tack the boat.
B. In a tourist guidebook.
C. In a physics textbook.
D. In an official report.
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