英语语法分析

So far, specialists have worked to add preservative materials to the churches' exteriors.

到目前为止，专家们一直在为教堂外围添加防腐性材料。

The preservative used is usually ethylene glycol or propylene glycol, as alcohol will evaporate quickly and the traps will dry out.

常用防腐剂是乙二醇或丙二醇，因为随着酒精快速挥发，捕集器也随之恢复干燥。

A pitfall trap can be any small container placed in the ground with the top level with the surrounding surface and filled with a preservative.

陷阱可以是任何放置在地面上的小容器，其顶部与周围的表面齐平，并装满防腐剂。