-----------------------------------
冷える， ひえる
1. to grow cold (from room temperature, e.g. in refrigerator), to get chilly, to cool down
冷、变冷、冷起来
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
