3 Why Do I Grow

WHY DO I GROW? WHY DO I?

我为什么要成长？为什么呢？

How Tall Are You? Are you taller than your friend, but shorter than your brother? Do your fingernails always need a trim? Do they feel like they are not growing at all? Has your doctor ever measured how tall you are? Children's bodies grow every day. Your bones get bigger and your bodies get taller. Some children grow quickly, and some grow slowly. You stop growing taller as an adult.

你有多高？你比你的朋友高，但比你的兄弟矮吗？ 你的指甲总是需要修剪吗？ 他们觉得自己根本没有成长吗？ 你的医生测量过你的身高吗？ 孩子们的身体每天都在生长。 你的骨头变大，你的身体变高。 有些孩子长得快，有些长得慢。 成年后你就不再长高了。

Growing Up As we get older, we grow bigger and stronger. Growing is an important part of getting older. You might be small or short now, but one day you might be even taller than your teacher! People usually stop growing taller when they are around 18 to 21 years old. But their hair and nails usually keep growing longer, even when they become old.

随着年龄的增长，我们变得越来越大，越来越强壮。 成长是变老的重要组成部分。 你现在可能很小或很矮，但是有一天你可能比你的老师还高！人们通常在18到21岁左右停止长高。 但是他们的头发和指甲通常会长得更长，即使他们变老了。

What makes You Grow? Your body makes chemicals that allow you to grow. These chemicals are called hormones. Hormones carry information and instructions that tell different parts of your body to do certain things, such as grow. Hormones are carried around your body in your blood. Different hormones do different jobs. The main hormone that makes you grow is called growth hormone. Hormones are made by body parts called glands.

是什么让你成长？你的身体会产生让你成长的化学物质。 这些化学物质被称为激素。 荷尔蒙携带着信息和指令，告诉你身体的不同部位去做某些事情，比如生长。 荷尔蒙通过血液在你的身体中传递。 不同的荷尔蒙有不同的作用。 使你生长的主要激素叫做生长激素。 荷尔蒙是由被称为腺体的身体部位产生的。

Glands and Growth There are glands in many places inside your body. The gland that helps you grow is in your brain. A hormone made in another part of the brain gives instructions to the pituitary gland. These instructions tell the pituitary gland when to send out growth hormone, and when to stop. The pituitary gland is a small gland in your brain. The pituitary gland creates growth hormone. Growth hormone tells our bodies to GROW.

腺体和生长在你身体的很多地方都有腺体。 帮助你成长的腺体在你的大脑里。 大脑另一部分产生的一种激素向脑下垂体发出指令。 这些指令告诉脑下垂体何时释放生长激素，何时停止。 脑下垂体是大脑中的一个小腺体。 脑下垂体产生生长激素。 生长激素告诉我们的身体生长。

Growing Differently Inches Centimeters Not everyone grows at the same pace. Some children might grow more quickly than other children who are the same age. Some children grow more slowly. The children in your class might all be the same age. But are they all the same height? The hormones in each person's body decide how fast or slow they grow.

不同的生长英寸厘米不是每个人都以同样的速度生长。 有些孩子可能比其他同龄的孩子长得更快。 有些孩子长得比较慢。 你们班的孩子可能都是同龄的。 但是他们都一样高吗？ 每个人体内的荷尔蒙决定了他们生长的快慢。