be made of 由。。制造而成。如Paper is made of wood.
be made in 。。制造。如 This watch is made in China.
in front of 在。。前面。
in the front of在。。前面
如:你坐在教室前面。猫在教室的前面(教室外)。
You are sitting in the front of the classroom.
The cat is in front of the classroom.
This cup is made of plastic. 用塑胶制造
This cup was made in China. 中国制造
in front of 在某个事物的前面
in the front of 在某个事物的前部分