downcast

noun

1. a ventilation shaft through which air enters a mine

adj

1. filled with melancholy and despondency

e.g. gloomy at the thought of what he had to face
gloomy predictions
a gloomy silence
took a grim view of the economy
the darkening mood
lonely and blue in a strange city
depressed by the loss of his job
a dispirited and resigned expression on her face
downcast after his defeat
feeling discouraged and downhearted

Synonym: gloomygrimbluedepresseddispiriteddown(p)downhearteddown in the mouthlowlow-spirited

2. directed downward

e.g. a downcast glance

1. 沮丧的;悲观的
If you are downcast, you are feeling sad and without hope.

e.g. Barbara looked increasingly downcast as defeat loomed.
当败象已呈时，芭芭拉看上去越来越沮丧。
e.g. ...a glum, downcast expression.
忧郁、沮丧的表情

2. (眼睛通常因难过或尴尬)向下看的，低垂的
If your eyes are downcast, you are looking towards the ground, usually because you are feeling sad or embarrassed.

e.g. She was silent, her eyes downcast.
她一言不发，两眼低垂。

1.

1. 向下转换：创建额外的屏幕概念(screen concepts)我不再需要修改程序控制器和提供器类. 对于新的Shell概念(screen concepts),这个构架是开放的可扩展的,而程序控制器和单独的提供器类对于修改是关闭的. // 这是 向下转换(downcast) 的一个例子

2. 向下重塑：从基类重塑(cast)到其派生类的过程通常被称为向下重塑(downcast),因为这个转换过程在表示继承关系的树结构中显示了从上到下的移动方向. 同样从派生类重塑到其基类的过程被称为向上重塑(upcast). 像BBwindow重塑到Ival_box这样,从基类重塑到其兄弟类的过程被称为交叉重塑(crosscast)

3.

3. 气馁的：downbent 向下弯曲的 | downcast 气馁的 | downcome 下降

4. 锅炉)降水管：downcast ventilator 下向通风筒 | downcast 锅炉)降水管 | downcast 降水管