the model plane is made of used wood and glass 为什么要用used捏?去掉直接说be made of wood and glass不行吗

The white model plane is hers The white model plane is hers.划线提问（The white model plane划线） is plane model on the table the 连词成句 The notebook is under the model plane 改为否定句 The boy is making a model plane 改成一般疑问句 The white model plane is hers 改为否定句 hers,is,model,plane,the.连词成句 plane white the model mine is连词成句 model the not whie mine is plane连词成句 The function f,defined by f(t)=6+cos(t/40)+3sin(7t/40),is used to model the velocity of the plane,in miles per minute,for 0≤t≤40.According to thhis model,waht is the acceleration of the plane at t=23?What is the average velocity of the plane,in m can the girl fly the model plane 连词成句 hers,is,plane,model,white.2 mike’shouse,next,to,is,the,school. the white model plane is under the chair改为一般疑问句 The yellow model plane on the floor is my friend's.改成一般疑问句 the white model plane is under the desk改为一般疑问句,并做否定回答 model plane Are_____(it) under the model plane? Tom's model plane is on the desk.改成同义句