I. Explanation:

1, a part of the trunk, opposite to the chest and abdomen.

2.(~) The reverse or back of some objects.

3. (Bei) surname.

4. Turn your back (opposite to "direction").

Step 5 leave.

6. avoid; Hide.

7. Recite.

8. Violation of regulations; Violate.

9. In the opposite direction.

10, remote.

1 1, not smooth; Bad luck.

12, hearing loss.

13, (people) carrying.

14, burden; Bear.

15 refers to the amount of one person's back at a time.

Second, the word group:

1. Endorsement: Recite the contents of the book. Sign on the back of a bill or document. Generally refers to taking joint responsibility for something.

2, behind: (name) behind. Not personally.

3. Backpack: a bag or military blanket bag used to carry personal belongings.

4, betrayal: (moved) deviation, rebellion.

5, vest: (name) collarless and sleeveless, can only cover the chest, abdomen and back blouse.

Examples of memorizing words:

1, carrying such a heavy backpack, I soon sweated.

2. When you are tired, you can carry a backpack and travel far, so that your mind can be intoxicated in the beautiful scenery and stay away from the noise of the world.

3, a backpack, a plane ticket, a SLR, a lover who can take pictures, I am eager for a trip without a deadline.

The schoolbag has three layers, and each layer has a large and small pocket. There is a small pocket on the left and right of the schoolbag, which I can use to hold the kettle. There are two wide and soft belts at the back. I'm sure it must be very comfortable on my back.

Carrying a schoolbag to school every day is like a heavy schoolbag for us.

6. This is my first backpacking trip alone, my first stay in a youth hostel and my first rock climbing. I expect more firsts.

7. I travel alone. In my broken backpack, I want to send you a letter. I wrote some stories and thought of you at that time.

8. Mother opened her backpack and took out many things from it: chocolate, sausage, bread, peanuts, milk ... She gave them to small animals.

9. The backpack made of nylon is waterproof.

10, he left this backpack on the street and walked away.