built-in stability在经济学中是什么意思?

built-in stability在经济学中是什么意思? built-in built-in是什么意思 built in display是什么意思 built-in iSight是什么 什么是built-in-telephone? Surface flame patterns and stability characteristics in a 英语翻译built-in sensor interface It was built in 1078. built-in obsolescence 什么意思? there are many people wandering in this city to see the old castles built in the sixteenth century.请问在castles后为什么不用被动语was built而只用built,是不是省略了什么? 有一道题答案 was built 对么?built前加was?为什么?这是我在练习册上看到的This post office (was built) in 1990. 为什么built 前面要加was? 这对么?为什么This post office （built） in 1990.这样写行么？ a new gymnasium is being built in our neighborhood is being built 为什么不用built为什么不用is built Showalter stability rome was not built in a rome is not built in a Rome wasn’t built in a day. Rome wasn't built in a