Been is the past participle of . (be)的过去分词
V-I If you have been to a place, you have gone to it or visited it. 去过
He's already been to Tunisia, and is to go on to Morocco and Mauritania.
他已经去过了突尼斯，还将接着去摩洛哥和毛里塔尼亚。
Acetabulum fracture, the inner fracture of the joint, has be en divided into 10 kinds.
髋臼骨折是关节内骨折，骨折分为10种类型。
The concept was revived in 1928 in Amsterdam. The Olympic Torch Relay has be en a tradition since 1952.
1928年在阿姆斯特丹的奥运会上这一思想又被重新启用。奥运火炬是从1952年以来一直沿用的一种传统。
The dynamic behaviour of spinning spindle has be en analyzed by the use of modern year's nonlinear dynamics.
用近代非线性动力学理论分析了纺纱锭子的动态特性。
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