Observer在Update()方法中，对传递进来的引用进行一个向下转换(Downcast)，转换成具体的Subject类(比如热水器)，然后通过这个引用调用Subject实体类(热水器)的公共属性获取状态信息(从中把有用数据拉出来...
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... [fall] 从天而降;落下 [downcast] 低落 [parachute] 一种折叠伞形的装备,用轻质纤维制造,使携带此伞的物体对空气产生阻力而速度减慢,专门用于从飞机上跳出安全降落,空投装备、物质或使飞机着陆后得到减速 ...
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Encapsulate Downcast 封装「向下转型」动作 ; 封装向下转型动作 ; 封装「向下转型」举措
downcast side [地质] 陷落侧 ; 下落翼
downcast fault 下落断层
downcast tube 下降管立管直浇口
downcast person 不愉快的人或脾气坏的人
"a downcast glance"
"downcast after his defeat"
同义词： blue depressed dispirited down(p) downhearted down in the mouth low low-spirited
以上来源于: WordNet
ADJ If you are downcast, you are feeling sad and without hope. 情绪低落的 [usu v-link ADJ]
Barbara looked increasingly downcast as defeat loomed.
失败越临近，芭芭拉的情绪看上去越为低落。
ADJ If your eyes are downcast, you are looking toward the ground, usually because you are feeling sad or embarrassed. (因伤心或尴尬而)向下看的 [usu v-link ADJ]
She was silent, her eyes downcast.
她不做声，目光低垂。
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