Forests vary greatly in composition from one part of the country to another.

　　一個(gè)國家不同區(qū)域的森林在組成結(jié)構(gòu)上存在很大的差異。

　　Television has transformed the size and social composition of the audience at great sporting occasions

　　電視改變了重大體育賽事觀眾的規(guī)模和其社會(huì)階層構(gòu)成結(jié)構(gòu)。

　　He taught the piano, organ and composition

　　他教授鋼琴、管風(fēng)琴和作曲。

　　He handed his composition to the teacher.

　　他把作文交給了老師。

　　Please shorten your composition.

　　請(qǐng)壓縮一下你的作文。