1、知识详解①expand vi. 膨胀 vt. 扩大,扩充(回归课本P41)Whenyouheatametal,itexpands.当你加热金属时,它就会膨胀。【归纳总结】expandsth.使……膨胀,扩大expandon/uponsth.详述,充分叙述expansionn.扩张,膨胀①Metalsexpandwhentheyareheated.金属受热会膨胀。②Aschildrengrowoldertheyexpandtheirinterestsandbecomemoreconfident.随着儿童的成长,他们的兴趣会变广,人也会变得