Cultures—National and International

A persistent trend in our present world is becoming more and more obvious these years. As is vividly shown in the picture, an American girl who is in the chinese costume is smiling in the photo.The main driver of this trend is mutual understanding in cultures.
There is no doubt we have led a mordern high-tech life and communication between people has vastly changed.People from differnent countires can express their opinions in the Internet.Therefore,various cultures are being understood and exchanged.There are a great number of foreigners who are willing to study Chinese which is believed to be mysterious (what do you mean by mysterious? like strange? i think, strange would be the more appropriate word to use in this context) and but interesting. For chinese ,many tend to study foreign languages and intended to watch foreign movies to compare notes.
Cultural exchangeing represents an existing harmonyious in the world existing .A better world need us to build. (I think this could be rephrased as "The world needs us for it to be better." or "We can build a better world." something like that.) It's our duty to take the responsibility to construct a more wonderful world!

grammar is not bad. maybe you need to read more for additional vocabs. but overall, this composition is good. great job april! :)