他们研究了半个世纪以来世界各地渔业的数据。
They have looked at half a century of data from fisheries around the world.
这种运输模式的改变不可能一蹴而就，尤其是近半个世纪以来，铁路等运输模式不断萎缩，让位于公路，能实现的改变就更少了。
Such a change cannot be achieved overnight, all the less so after over half a century of constant deterioration in favour of road.
半个世纪以来，双方建立了深厚的传统友谊。
Over the past half a century, both sides have established a profound traditional friendship.
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