the only thing constant in life is change meaning

We are living in the century of globalization, and English is viewed as an international language. In high school, studying other languages like Spanish, French, German or Latin are just subjects and that we can forget it when finishing the course. Nonetheless, in these days, Chinese is developing detail by detail and becomes considered one of interesting subjects in high school and college. Furthermore, a great number of learn Chinese through online courses for the Internet. Why? We can see that Chinese can be so popular that 1 billion people speak it. The Chinese language not merely creates joy for Chinese learners in studying but also brings a handy tool for businessmen and tourists on the world. Sweet potatoes are fairly inexpensive but very helpful for our health. It contains more vitamins (A, B, C, E), protein, starch, amino acids as well as over ten types of vital elements (calcium, magnesium, iron, zinc). In addition, the foodstuff comes with a abundant level of fiber that can stimulate stomach contractions. Another important thing is oligosaccharides in sweet potatoes maintain the elasticity, reduce blood levels of cholesterol and ease circulation in the blood vessels.