小组探究:用教材图甲的装置分四步进行.
当地面或物体表面温度在0℃以下时,空气中的水汽会在其表面凝华成白色结晶,称为霜。结合“某地区某年1月10日霜区分布示意图”,完成下列问题。
We should try to help the ____________ because they have an illness which makes it difficult for them to move around.