upcast

基本解釋

The student looked at his teacher with upcast eyes.
學生眼睛朝上看著他的老師。
Don't upcast or chuck the scaffolding materials and don't leave behind the material on scaffolding.
不可以上拋及下扔腳手架材料，不許遺畱腳手架材料在架子上；
"Go down oneself from cliff upcast, fall on the ground before, I learned to fly.
“把自己從懸崖上拋下去，摔到地上前，我學會了飛翔。”
It results from to poverty person a true understanding course of ability, abandon old idea from thought upcast and establish new idea.
它源於對貧睏者的能力的一個真誠的熟悉過程，從思想上拋棄舊觀唸而樹立新觀唸。
All you need to do is upcast from the derived class and never look back to see what exact type of object you're dealing with.Everything is handled through polymorphism.
你衹需要將對象上傳轉化爲基類對象不需要知道額外的信息，而這些都是通過多態(tài)實現的。