火車的種類: steam train, freight train, circus train, cold train, graintrain, coal train, people-on-the-go train, bullet train 火車的部件: piston,rod,wheel 軌道的組成: steel rail,wood tie 形容詞性物主代詞的用法，例如: my, their 介詞的用法，例如: in,on, at, over, through 連詞的用法，例如: and,or 定語從句，例如: Trains have special wheels that roll on tracks 祈使句，例如: Look at some of these inventions. There be 句型，例如: There are train tracks all over the world. -般過去時的用法，例如: Robbers wanted to steal the money andgold.