inheritance hierarchy

基本解釋

Changing the inheritance hierarchy of an object requires a declare parents tag.
改變對(duì)象的繼承層次需要一個(gè) declare parents 標(biāo)簽。
There is inheritance, though: SDO understands an inheritance hierarchy among types, and given a property expecting a given type, you can assign a subtype.
但存在繼承性：SDO 理解類(lèi)型間的繼承層次結(jié)構(gòu)，給定屬性要求給定類(lèi)型，可指派子類(lèi)型。
Given an object (such as Foo, defined below), static crosscutting makes it quite simple to create new methods, add additional constructors, and even alter the inheritance hierarchy.
給定一個(gè)對(duì)象（比如下面定義的 Foo ），靜態(tài)橫切使得創(chuàng)建新方法、添加附加的構(gòu)造函數(shù)，甚至改變繼承層次都變得十分簡(jiǎn)單。