vallation

n.

壁垒，筑城术；炮垒；筑垒；

1. The green vallation was the main obstacle for the export of baisens because of the production manner of baisens and harmful organisms in baisens.
   由于我国盆景生产的方式以及有害生物的问题，绿色壁垒成为我国盆景出口的瓶颈。
2. After china open its procurement market, more attention should be taken on those uncompetitive manners because they are legal trade vallation.
   待政府采购市场对外开放之后，再给予那些限制竞争的采购方式以更多的关注，发挥它们的合法贸易壁垒的作用。

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Byzantine Empire under the Isaurian dynasty