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For mechanical optimization design, please refer to the following.
Footprint of growth

The footprint of growing up, from the past to the present, is my best memory ... During my growing up, I grew up in a happy life under the care of my parents. In the process of my growth, I kept learning new knowledge and constantly realized the hardships and happiness in my study and life. Day after day, year after year, flowers bloom and fall quietly.

Suddenly I heard a friend say that his birthday was coming. I smiled and wished him a happy birthday on his thirteenth birthday. It suddenly occurred to me that this year is 8.25, and I am 13 years old. It's almost 13 years before I know it, so I have to say something tacky-how time flies! In retrospect, I really experienced a lot, grew a lot and understood a lot.

When I was a child, I always liked to run across the pond and leave footprints, and then I looked back at my masterpiece and ran away with a smile ... I also left footprints on the road of growth. These footprints are deep and shallow, and each footprint contains a story. ......

At that time, when I was young, I was naive, naughty, lively and smart. At that time, I cried every day for adults to tell stories with me and play games that bothered adults. Once, I was seriously ill, and my parents took turns to stay with me in the hospital for a month. At that time, I really realized the care of my parents.

When I was a child in kindergarten, it was my happiest time. At that time, I was carefree. I started playing fan cards with my classmates after class every day, and my nose was running out. Just waving my sleeve. It's really funny to think about it now.

Then I went to primary school. This made me realize for the first time that the things stuck together with black characters printed on thin paper were called "books", and I learned a lot one by one for the first time. Growing up made me get rid of my naughty childhood, let me know what to do and what not to do, and also know to finish my homework. Growing up really brings people joys and sorrows.

Now it seems that at that time, I was just a naive, ridiculous, lovely and naughty child. I couldn't believe it. My nose was almost running out. I was the kid who ran away with a wave of his sleeve.

Now, on the road of our growth, we may encounter bumps and misfortunes. Growth is a familiar and unfamiliar word.

Now, I am more and more aware of my parents' love for me, that kind of selfless love. When I get to middle school, I have to get up early every day because I have to go to school early. But after a hard day, my mother got up earlier than me. Whenever breakfast is almost ready, I start to wash my face and brush my teeth. After washing, I had breakfast and started a day of study and life.

Grow up! You are like an earthquake monitor, recording all traces and updating them from time to time; When I grow up, you are like a tree ring, recording the storms I have experienced; Grow up! You are like a calculator. As soon as you go to zero, everything disappears.

I grew up anywhere.