Objects in Self have a parent object and slots that contain other objects or methods.
Self中的对象都有一个父对象以及包含其他对象或方法的slot。
He defined active objects as objects having their own thread of control (or, self-powered).
他将活动对象定义为具有自己的控制线程(或自己为自己提供支持)的对象。
Objects can cast shadows onto each other and onto parts of themselves (" self shadowing ").
物体可以投射阴影到彼此的上面,以及投射到自身上(自身阴影)。
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